$CDNA
CareDx Inc Stock $cdna

$cdna Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000121723421000046 Filed on February 24, 2021

Income Statement

Concept	2020 Q4	2019 Q4	2018 Q4
Revenue	$58.64M	$35.82M	$23.51M
YoY Change	63.7%	52.37%	88.03%
Cost Of Revenue	$18.89M	$12.72M	$10.51M
YoY Change	48.51%	21.03%	88.01%
Gross Profit	$39.76M	$23.11M	$13.00M
YoY Change	72.05%	77.77%	88.13%
Gross Profit Margin	67.8%	64.52%	55.3%
Selling, General & Admin	$29.50M	$19.70M	$11.63M
YoY Change	49.75%	69.39%	59.32%
% of Gross Profit	74.2%	85.24%	89.46%
Research & Development	$13.33M	$8.950M	$3.780M
YoY Change	48.94%	136.77%	24.75%
% of Gross Profit	33.53%	38.73%	29.08%
Depreciation & Amortization	$1.960M	$1.680M	$1.180M
YoY Change	16.67%	42.37%	15.69%
% of Gross Profit	4.93%	7.27%	9.08%
Operating Expenses	$42.82M	$28.65M	$15.41M
YoY Change	49.46%	85.92%	37.59%
Operating Profit	-$3.060M	-$5.540M	-$2.410M
YoY Change	-44.77%	129.88%	-43.82%
Interest Expense	-$380.0K	$640.0K	$1.390M
YoY Change	-159.38%	-53.96%	-104.98%
% of Operating Profit
Other Income/Expense, Net	-$240.0K	-$80.00K	$2.710M
YoY Change	200.0%	-102.95%	-1003.33%
Pretax Income	-$3.690M	-$4.980M	-$4.090M
YoY Change	-25.9%	21.76%	-87.42%
Income Tax	-$170.0K	-$200.0K	-$340.0K
% Of Pretax Income
Net Earnings	-$3.520M	-$4.777M	-$3.755M
YoY Change	-26.31%	27.22%	-88.14%
Net Earnings / Revenue	-6.0%	-13.34%	-15.97%
Basic Earnings Per Share		-$0.11	-$0.09
Diluted Earnings Per Share	-$71.33K	-$0.11	-$0.09
COMMON SHARES
Basic Shares Outstanding	49.26M shares	42.46M shares	40.10M shares
Diluted Shares Outstanding		42.46M shares	40.10M shares

Balance Sheet

Concept	2020 Q4	2019 Q4	2018 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$224.7M	$38.20M	$64.60M
YoY Change	488.22%	-40.87%	282.25%
Cash & Equivalents	$134.7M	$38.22M	$64.62M
Short-Term Investments	$90.00M
Other Short-Term Assets	$3.800M	$3.600M	$1.800M
YoY Change	5.56%	100.0%	28.57%
Inventory	$10.01M	$6.014M	$4.943M
Prepaid Expenses
Receivables	$34.62M	$24.06M	$9.760M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$273.1M	$71.92M	$81.11M
YoY Change	279.71%	-11.33%	203.04%
LONG-TERM ASSETS
Property, Plant & Equipment	$10.70M	$4.430M	$4.134M
YoY Change	141.63%	7.16%	99.23%
Goodwill	$23.86M	$23.86M	$12.01M
YoY Change	0.0%	98.73%	0.0%
Intangibles	$44.36M	$45.54M	$33.25M
YoY Change	-2.6%	36.96%	0.34%
Long-Term Investments
YoY Change
Other Assets	$1.000M	$1.000M	$0.00
YoY Change	0.0%		-100.0%
Total Long-Term Assets	$95.41M	$79.81M	$49.58M
YoY Change	19.55%	60.97%	-12.7%
TOTAL ASSETS
Total Short-Term Assets	$273.1M	$71.92M	$81.11M
Total Long-Term Assets	$95.41M	$79.81M	$49.58M
Total Assets	$368.5M	$151.7M	$130.7M
YoY Change	142.86%	16.1%	56.4%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$9.653M	$5.506M	$4.711M
YoY Change	75.32%	16.88%	38.93%
Accrued Expenses	$25.60M	$18.80M	$11.20M
YoY Change	36.17%	67.86%	28.74%
Deferred Revenue	$3.530M	$3.686M	$39.00K
YoY Change	-4.23%	9351.28%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$0.00	$0.00	$0.00
YoY Change			-100.0%
Total Short-Term Liabilities	$69.22M	$34.83M	$19.50M
YoY Change	98.74%	78.57%	-54.54%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$0.00
YoY Change			-100.0%
Other Long-Term Liabilities	$240.0K	$1.751M	$2.294M
YoY Change	-86.29%	-23.67%	74.45%
Total Long-Term Liabilities	$240.0K	$1.751M	$2.294M
YoY Change	-86.29%	-23.67%	-88.33%
TOTAL LIABILITIES
Total Short-Term Liabilities	$69.22M	$34.83M	$19.50M
Total Long-Term Liabilities	$240.0K	$1.751M	$2.294M
Total Liabilities	$90.83M	$52.74M	$34.77M
YoY Change	72.24%	51.68%	-61.16%
SHAREHOLDERS EQUITY
Retained Earnings	-$352.5M	-$333.8M	-$311.8M
YoY Change	5.61%	7.04%	16.35%
Common Stock	$632.3M	$438.0M	$412.1M
YoY Change	44.36%	6.3%	55.94%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$277.7M	$99.00M	$95.93M
YoY Change
Total Liabilities & Shareholders Equity	$368.5M	$151.7M	$130.7M
YoY Change	142.86%	16.1%	56.4%

Cashflow Statement

Concept	2020 Q4	2019 Q4	2018 Q4
OPERATING ACTIVITIES
Net Income	-$3.520M	-$4.777M	-$3.755M
YoY Change	-26.31%	27.22%	-88.14%
Depreciation, Depletion And Amortization	$1.960M	$1.680M	$1.180M
YoY Change	16.67%	42.37%	15.69%
Cash From Operating Activities	$7.180M	-$1.080M	$2.000M
YoY Change	-764.81%	-154.0%	-193.02%
INVESTING ACTIVITIES
Capital Expenditures	-$440.0K	-$1.230M	-$960.0K
YoY Change	-64.23%	28.13%	966.67%
Acquisitions
YoY Change
Other Investing Activities	-$90.03M	-$110.0K	$0.00
YoY Change	81745.45%		-100.0%
Cash From Investing Activities	-$90.47M	-$1.340M	-$960.0K
YoY Change	6651.49%	39.58%	-80.95%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	3.960M	80.00K	37.31M
YoY Change	4850.0%	-99.79%	108.2%
NET CHANGE
Cash From Operating Activities	7.180M	-1.080M	2.000M
Cash From Investing Activities	-90.47M	-1.340M	-960.0K
Cash From Financing Activities	3.960M	80.00K	37.31M
Net Change In Cash	-79.33M	-2.340M	38.35M
YoY Change	3290.17%	-106.1%	257.41%
FREE CASH FLOW
Cash From Operating Activities	$7.180M	-$1.080M	$2.000M
Capital Expenditures	-$440.0K	-$1.230M	-$960.0K
Free Cash Flow	$7.620M	$150.0K	$2.960M
YoY Change	4980.0%	-94.93%	-243.69%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
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CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	001-36536
CY2020	dei	Entity Registrant Name EntityRegistrantName	CAREDX, INC.
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	94-3316839
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	1 Tower Place
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	South San Francisco
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	94080
CY2020	dei	City Area Code CityAreaCode	415
CY2020	dei	Local Phone Number LocalPhoneNumber	287-2300
CY2020	dei	Security12b Title Security12bTitle	Common Stock, par value $0.001 per share
CY2020	dei	Trading Symbol TradingSymbol	CDNA
CY2020	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46481772	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	42151617	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	35638956	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	46481772	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	42151617	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	35638956	shares
CY2020	us-gaap	Profit Loss ProfitLoss	-18714000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-21968000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	-46781000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	3109000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-927000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-1933000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-15605000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-22895000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-48714000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-25000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-15605000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-22895000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-48689000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-5954000	USD
CY2018	cdna	Adjustments To Additional Paid In Capital Reclassification Of Warrants From Liability To Equity AdjustmentsToAdditionalPaidInCapitalReclassificationOfWarrantsFromLiabilityToEquity	6550000	USD
CY2018	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	3800000	USD
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	52549000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Equity Component Of Convertible Debt AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	38852000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	287000	USD
CY2018	us-gaap	Restricted Stock Value Shares Issued Net Of Tax Withholdings RestrictedStockValueSharesIssuedNetOfTaxWithholdings	-698000	USD
CY2018	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	273000	USD
CY2018	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1480000	USD
CY2018	cdna	Issuance Of Common Stock For Cash Upon Exercise Of Warrants Value IssuanceOfCommonStockForCashUponExerciseOfWarrantsValue	38712000	USD
CY2018	cdna	Noncontrolling Interest Increase Decrease From Business Combination NoncontrollingInterestIncreaseDecreaseFromBusinessCombination	-692000	USD
CY2018	cdna	Stock Issued During Period Value Business Acquisitions StockIssuedDuringPeriodValueBusinessAcquisitions	2689000	USD
CY2018	cdna	Issuance Of Warrants In Connection With Perceptive Debt IssuanceOfWarrantsInConnectionWithPerceptiveDebt	784000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-1933000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	-46781000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	95928000	USD
CY2019	cdna	Additional Paid In Capital Contingent Consideration Classified As Equity AdditionalPaidInCapitalContingentConsiderationClassifiedAsEquity	222000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	759000	USD
CY2019	us-gaap	Restricted Stock Value Shares Issued Net Of Tax Withholdings RestrictedStockValueSharesIssuedNetOfTaxWithholdings	-4152000	USD
CY2019	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	209000	USD
CY2019	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	3553000	USD
CY2019	cdna	Issuance Of Common Stock For Cash Upon Exercise Of Warrants Value IssuanceOfCommonStockForCashUponExerciseOfWarrantsValue	3181000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	22195000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-927000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-21968000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	99000000	USD
CY2020	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1393000	USD
CY2020	us-gaap	Restricted Stock Value Shares Issued Net Of Tax Withholdings RestrictedStockValueSharesIssuedNetOfTaxWithholdings	-4529000	USD
CY2020	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	315000	USD
CY2020	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	8007000	USD
CY2020	cdna	Issuance Of Common Stock For Cash Upon Exercise Of Warrants Value IssuanceOfCommonStockForCashUponExerciseOfWarrantsValue	8008000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	23055000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	3109000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-18714000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	277679000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-18714000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-21968000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	-46781000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	23401000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	22417000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	7138000	USD
CY2020	us-gaap	Cost Of Goods And Services Sold Depreciation CostOfGoodsAndServicesSoldDepreciation	0	USD
CY2019	us-gaap	Cost Of Goods And Services Sold Depreciation CostOfGoodsAndServicesSoldDepreciation	0	USD
CY2018	us-gaap	Cost Of Goods And Services Sold Depreciation CostOfGoodsAndServicesSoldDepreciation	234000	USD
CY2020	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	0	USD
CY2019	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-160000	USD
CY2018	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	0	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	7006000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	5523000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	4215000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	2538000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1621000	USD
CY2018	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	0	USD
CY2020	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-1495000	USD
CY2019	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	319000	USD
CY2018	us-gaap	Unrealized Gain Loss On Investments UnrealizedGainLossOnInvestments	-22978000	USD
CY2020	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	309000	USD
CY2019	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	210000	USD
CY2018	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	1017000	USD
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	0	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	0	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2232000	USD
CY2020	cdna	Loss On Conversion Of Debt To Equity LossOnConversionOfDebtToEquity	0	USD
CY2019	cdna	Loss On Conversion Of Debt To Equity LossOnConversionOfDebtToEquity	0	USD
CY2018	cdna	Loss On Conversion Of Debt To Equity LossOnConversionOfDebtToEquity	5831000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	10402000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	12675000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	3967000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	3196000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	1270000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-363000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Expenses Other IncreaseDecreaseInPrepaidExpensesOther	41000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Expenses Other IncreaseDecreaseInPrepaidExpensesOther	829000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Expenses Other IncreaseDecreaseInPrepaidExpensesOther	502000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	4389000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	1351000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-168000	USD
CY2020	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	5737000	USD
CY2019	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	3115000	USD
CY2018	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	4291000	USD
CY2020	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	2911000	USD
CY2019	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	3029000	USD
CY2018	us-gaap	Increase Decrease In Other Accrued Liabilities IncreaseDecreaseInOtherAccruedLiabilities	719000	USD
CY2020	cdna	Increase Decrease In Operating Lease Liabilities IncreaseDecreaseInOperatingLeaseLiabilities	-1475000	USD
CY2019	cdna	Increase Decrease In Operating Lease Liabilities IncreaseDecreaseInOperatingLeaseLiabilities	-1854000	USD
CY2018	cdna	Increase Decrease In Operating Lease Liabilities IncreaseDecreaseInOperatingLeaseLiabilities	0	USD
CY2020	cdna	Increase Decrease In Contract With Customer Liability Current Advance Payment Cares Act IncreaseDecreaseInContractWithCustomerLiabilityCurrentAdvancePaymentCARESAct	-20496000	USD
CY2019	cdna	Increase Decrease In Contract With Customer Liability Current Advance Payment Cares Act IncreaseDecreaseInContractWithCustomerLiabilityCurrentAdvancePaymentCARESAct	0	USD
CY2018	cdna	Increase Decrease In Contract With Customer Liability Current Advance Payment Cares Act IncreaseDecreaseInContractWithCustomerLiabilityCurrentAdvancePaymentCARESAct	0	USD
CY2020	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	1023000	USD
CY2019	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	1280000	USD
CY2018	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	1607000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	33431000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-2769000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-4007000	USD
CY2020	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	90034000	USD
CY2019	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	0	USD
CY2018	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	0	USD
CY2020	cdna	Payments To Acquire Capital Expenditures Net PaymentsToAcquireCapitalExpendituresNet	7110000	USD
CY2019	cdna	Payments To Acquire Capital Expenditures Net PaymentsToAcquireCapitalExpendituresNet	2201000	USD
CY2018	cdna	Payments To Acquire Capital Expenditures Net PaymentsToAcquireCapitalExpendituresNet	2035000	USD
CY2020	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	3250000	USD
CY2019	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	1148000	USD
CY2018	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	5202000	USD
CY2020	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	18230000	USD
CY2018	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	692000	USD
CY2020	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	0	USD
CY2019	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	1000000	USD
CY2018	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	0	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-100394000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-22579000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-7929000	USD
CY2020	us-gaap	Proceeds From Debt Net Of Issuance Costs ProceedsFromDebtNetOfIssuanceCosts	0	USD
CY2019	us-gaap	Proceeds From Debt Net Of Issuance Costs ProceedsFromDebtNetOfIssuanceCosts	0	USD
CY2018	us-gaap	Proceeds From Debt Net Of Issuance Costs ProceedsFromDebtNetOfIssuanceCosts	14282000	USD
CY2020	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	183000	USD
CY2019	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	172000	USD
CY2018	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	28089000	USD
CY2020	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	0	USD
CY2019	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	225000	USD
CY2018	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	225000	USD
CY2020	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	0	USD
CY2019	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	0	USD
CY2018	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-677000	USD
CY2020	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	352000	USD
CY2019	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	105000	USD
CY2018	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	10998000	USD
CY2020	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	8006000	USD
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	3553000	USD
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1480000	USD
CY2020	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	1368000	USD
CY2019	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	760000	USD
CY2018	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	287000	USD
CY2020	cdna	Taxes Paid Related To Net Share Settlement Of Restricted Stock Units TaxesPaidRelatedToNetShareSettlementOfRestrictedStockUnits	4529000	USD
CY2019	cdna	Taxes Paid Related To Net Share Settlement Of Restricted Stock Units TaxesPaidRelatedToNetShareSettlementOfRestrictedStockUnits	4153000	USD
CY2018	cdna	Taxes Paid Related To Net Share Settlement Of Restricted Stock Units TaxesPaidRelatedToNetShareSettlementOfRestrictedStockUnits	698000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	163149000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-132000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	50268000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	274000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	-849000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	2000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	96460000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-26329000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	38334000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	38479000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	64808000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	26474000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	134939000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	38479000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	64808000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	10000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	22000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	1774000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	80000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	0	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	0	USD
CY2020	cdna	Shares Issued In Lieu Of Cash Payment SharesIssuedInLieuOfCashPayment	315000	USD
CY2019	cdna	Shares Issued In Lieu Of Cash Payment SharesIssuedInLieuOfCashPayment	209000	USD
CY2018	cdna	Shares Issued In Lieu Of Cash Payment SharesIssuedInLieuOfCashPayment	0	USD
CY2020	cdna	Common Stock Issued For Acquisition CommonStockIssuedForAcquisition	0	USD
CY2019	cdna	Common Stock Issued For Acquisition CommonStockIssuedForAcquisition	7207000	USD
CY2018	cdna	Common Stock Issued For Acquisition CommonStockIssuedForAcquisition	0	USD
CY2020	cdna	Operating Leases Right Of Use Assets Of Cash Flow Information OperatingLeasesRightOfUseAssetsOfCashFlowInformation	55000	USD
CY2019	cdna	Operating Leases Right Of Use Assets Of Cash Flow Information OperatingLeasesRightOfUseAssetsOfCashFlowInformation	6138000	USD
CY2018	cdna	Operating Leases Right Of Use Assets Of Cash Flow Information OperatingLeasesRightOfUseAssetsOfCashFlowInformation	0	USD
CY2020	cdna	Conversion Of Convertible Preferred Stock To Common Stock At Private Placement And Subsequent Financing ConversionOfConvertiblePreferredStockToCommonStockAtPrivatePlacementAndSubsequentFinancing	274000	USD
CY2019	cdna	Conversion Of Convertible Preferred Stock To Common Stock At Private Placement And Subsequent Financing ConversionOfConvertiblePreferredStockToCommonStockAtPrivatePlacementAndSubsequentFinancing	576000	USD
CY2018	cdna	Conversion Of Convertible Preferred Stock To Common Stock At Private Placement And Subsequent Financing ConversionOfConvertiblePreferredStockToCommonStockAtPrivatePlacementAndSubsequentFinancing	0	USD
CY2020	us-gaap	Debt Conversion Converted Instrument Amount1 DebtConversionConvertedInstrumentAmount1	0	USD
CY2019	us-gaap	Debt Conversion Converted Instrument Amount1 DebtConversionConvertedInstrumentAmount1	0	USD
CY2018	us-gaap	Debt Conversion Converted Instrument Amount1 DebtConversionConvertedInstrumentAmount1	38852000	USD
CY2020	cdna	Offering Costs OfferingCosts	0	USD
CY2019	cdna	Offering Costs OfferingCosts	0	USD
CY2018	cdna	Offering Costs OfferingCosts	361000	USD
CY2020	cdna	Employee Stock Purchase Plan Shares EmployeeStockPurchasePlanShares	800000	USD
CY2019	cdna	Employee Stock Purchase Plan Shares EmployeeStockPurchasePlanShares	703000	USD
CY2018	cdna	Employee Stock Purchase Plan Shares EmployeeStockPurchasePlanShares	341000	USD
CY2020	cdna	Debt Conversion Converted Instrument Common Stock Warrants Issued DebtConversionConvertedInstrumentCommonStockWarrantsIssued	0	USD
CY2019	cdna	Debt Conversion Converted Instrument Common Stock Warrants Issued DebtConversionConvertedInstrumentCommonStockWarrantsIssued	0	USD
CY2018	cdna	Debt Conversion Converted Instrument Common Stock Warrants Issued DebtConversionConvertedInstrumentCommonStockWarrantsIssued	784000	USD
CY2020	cdna	Common Stock Shares Issued For Contingent Consideration CommonStockSharesIssuedForContingentConsideration	0	USD
CY2019	cdna	Common Stock Shares Issued For Contingent Consideration CommonStockSharesIssuedForContingentConsideration	1442000	USD
CY2018	cdna	Common Stock Shares Issued For Contingent Consideration CommonStockSharesIssuedForContingentConsideration	2689000	USD
CY2018Q1	cdna	Number Of Renal Transplant Patients NumberOfRenalTransplantPatients	1700	patient
CY2020Q4	cdna	Number Of Transplant Centers Offering Remo Tra C NumberOfTransplantCentersOfferingRemoTraC	150	center
CY2020Q4	cdna	Number Of Patients Enrolled In Remo Tra C NumberOfPatientsEnrolledInRemoTraC	6000	patient
CY2020Q4	cdna	Number Of Mobile Phlebotomists NumberOfMobilePhlebotomists	10000	phlebotomist
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-352500000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents And Short Term Investments CashCashEquivalentsAndShortTermInvestments	224700000	USD
CY2020Q2	cdna	Cares Act Centers For Medicare And Medicaid Services Proceeds From Advance Payment CARESActCentersForMedicareAndMedicaidServicesProceedsFromAdvancePayment	20500000	USD
CY2019Q4	us-gaap	Grants Receivable GrantsReceivable	30000000000.0	USD
CY2019Q4	us-gaap	Grants Receivable GrantsReceivable	30000000000.0	USD
CY2020Q2	cdna	Proceeds From Grants ProceedsFromGrants	4800000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	300000	USD
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-top:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;text-decoration:underline">Use of Estimates</span></div><div style="margin-top:6pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities and the reported amounts of revenues and expenses in the consolidated financial statements and accompanying notes. On an ongoing basis, management evaluates its estimates, including those related to transaction price estimates used for testing revenue; standalone fair value of digital revenue performance obligations; accrued expenses for clinical studies; inventory valuation; the fair value of issued common stock warrants and embedded derivatives; the fair value of assets and liabilities acquired in a business combination or an assets acquisition (including identifiable intangible assets acquired); the fair value of contingent consideration recorded in connection with a business combination; the grant date fair value assumptions used to estimate stock-based compensation expense; income taxes; impairment of long-lived assets and indefinite-lived assets (including goodwill); and legal contingencies. Actual results could differ from those estimates.</span></div>
CY2020	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="margin-top:12pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;text-decoration:underline">Concentrations of Credit Risk and Other Risks and Uncertainties</span></div><div style="margin-top:6pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Financial instruments that potentially subject the Company to credit risk consist of cash, cash equivalents, marketable securities and accounts receivable. The Company’s policy is to invest its cash and cash equivalents in money market funds, obligations of U.S. government agencies and government-sponsored entities, commercial paper, corporate debt securities and various bank deposit accounts. These financial instruments are held in Company accounts at nineteen financial institutions. The counterparties to the agreements relating to the Company’s investments consist of financial institutions of high credit standing. The Company is exposed to credit risk in the event of default by the financial institutions to the extent of amounts recorded on the balance sheets that may be in excess of insured limits.</span></div><div style="margin-top:6pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company is also subject to credit risk from its accounts receivable, which are derived from revenue earned from AlloSure Kidney and AlloMap Heart tests provided for patients located in the U.S. and billed to various third-party payers, from sales of products to distributors, strategic partners and transplant laboratories in Europe, Asia, the Middle East, Africa, the U.S., Latin America and other geographic regions, and from sales of digital solutions software. The Company has not experienced any significant credit losses and does not require collateral on receivables. For the years ended December 31, 2020, 2019 and 2018, approximately 57%, 55% and 48%, respectively, of total revenue was billed to Medicare. No other payers represented more than 10% of total revenue for the years ended December 31, 2020, 2019 and 2018.</span></div><div style="margin-top:6pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">As of December 31, 2020 and 2019, approximately 28% and 36%, respectively, of accounts receivable was due from Medicare. No other payer represented more than 10% of accounts receivable at either December 31, 2020 or 2019.</span></div>
CY2020Q4	cdna	Number Of Financial Institutions Holding Financial Instruments NumberOfFinancialInstitutionsHoldingFinancialInstruments	19	financialInstitution
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	0	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-18714000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-21968000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-46756000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-18714000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-21968000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-46756000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46481772	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	42151617	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	35638956	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	46481772	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	42151617	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	35638956	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.40
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.52
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.31
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.40
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.52
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.31
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	4555528	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	4481383	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	4125710	shares
CY2020Q4	cdna	Number Of Investments NumberOfInvestments	1	investment
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	134669000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	38223000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	64616000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	270000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	256000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	192000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	134939000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	38479000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	64808000	USD
CY2020Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	90034000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	136000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	89898000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	90034000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	0	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	0	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	0	USD
CY2020Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	90034000	USD
CY2019Q2	us-gaap	Finite Lived Intangible Assets Fair Value Disclosure FiniteLivedIntangibleAssetsFairValueDisclosure	6600000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	23857000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	12005000	USD
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	11852000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	23857000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	23857000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	59816000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	15518000	USD
CY2020Q4	cdna	Finite Lived Intangible Foreign Currency Translation FiniteLivedIntangibleForeignCurrencyTranslation	1193000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	43105000	USD
CY2020Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	61066000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	15518000	USD
CY2020Q4	cdna	Finite Lived Intangible Foreign Currency Translation FiniteLivedIntangibleForeignCurrencyTranslation	1193000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	44355000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	57713000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	10719000	USD
CY2019Q4	cdna	Finite Lived Intangible Foreign Currency Translation FiniteLivedIntangibleForeignCurrencyTranslation	3556000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	43438000	USD
CY2019Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	59816000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	10719000	USD
CY2019Q4	cdna	Finite Lived Intangible Foreign Currency Translation FiniteLivedIntangibleForeignCurrencyTranslation	3556000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	45541000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4800000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3600000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2400000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	4900000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	4882000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	4882000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	4882000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	4882000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	18677000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	43105000	USD
CY2020Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	1702000	USD
CY2019Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	1236000	USD
CY2020Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	2936000	USD
CY2019Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	1189000	USD
CY2020Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	5374000	USD
CY2019Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	3589000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	10012000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	6014000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	27703000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	19523000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	16999000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	15093000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	10704000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	4430000	USD
CY2020	us-gaap	Depreciation Depreciation	1900000	USD
CY2019	us-gaap	Depreciation Depreciation	1600000	USD
CY2018	us-gaap	Depreciation Depreciation	1200000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	600000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset Before Accumulated Amortization FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization	600000	USD
CY2019Q4	cdna	Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization FinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	400000	USD
CY2020Q4	cdna	Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization FinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	400000	USD
CY2020	us-gaap	Adjustment For Amortization AdjustmentForAmortization	100000	USD
CY2019	us-gaap	Adjustment For Amortization AdjustmentForAmortization	200000	USD
CY2018	us-gaap	Adjustment For Amortization AdjustmentForAmortization	200000	USD
CY2020Q4	cdna	Accrued Clinical And Cost Of Other Studies Current AccruedClinicalAndCostOfOtherStudiesCurrent	6733000	USD
CY2019Q4	cdna	Accrued Clinical And Cost Of Other Studies Current AccruedClinicalAndCostOfOtherStudiesCurrent	3068000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	3530000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	3686000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2033000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	3017000	USD
CY2020Q4	cdna	Deferred Payments For Intangible Assets DeferredPaymentsForIntangibleAssets	2000000	USD
CY2019Q4	cdna	Deferred Payments For Intangible Assets DeferredPaymentsForIntangibleAssets	2098000	USD
CY2020Q4	us-gaap	Accrued Professional Fees Current AccruedProfessionalFeesCurrent	1529000	USD
CY2019Q4	us-gaap	Accrued Professional Fees Current AccruedProfessionalFeesCurrent	766000	USD
CY2020Q4	us-gaap	Accrued Royalties Current AccruedRoyaltiesCurrent	1072000	USD
CY2019Q4	us-gaap	Accrued Royalties Current AccruedRoyaltiesCurrent	547000	USD
CY2020Q4	us-gaap	Business Combination Contingent Consideration Liability Current BusinessCombinationContingentConsiderationLiabilityCurrent	738000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability Current BusinessCombinationContingentConsiderationLiabilityCurrent	810000	USD
CY2020Q4	cdna	Accrued Sample Processing Fees AccruedSampleProcessingFees	416000	USD
CY2019Q4	cdna	Accrued Sample Processing Fees AccruedSampleProcessingFees	835000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	2551000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	2011000	USD
CY2020Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	20602000	USD
CY2019Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	16838000	USD
CY2020Q2	cdna	Cares Act Centers For Medicare And Medicaid Services Proceeds From Advance Payment CARESActCentersForMedicareAndMedicaidServicesProceedsFromAdvancePayment	20500000	USD
CY2020Q1	cdna	Operating Lease Right Of Use Asset Increase OperatingLeaseRightOfUseAssetIncrease	13000000.0	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	15200000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2000000.0	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	16100000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	4441000	USD
CY2020	cdna	Finance Lease Cost FinanceLeaseCost	205000	USD
CY2020	us-gaap	Lease Cost LeaseCost	4646000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y3M18D
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P0Y5M1D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.105
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.054
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	4900000	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	2300000	USD
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	2000000.0	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	71000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	4562000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	5014000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	3769000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	3892000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	4037000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	10256000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	71000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	31530000	USD
CY2014Q2	cdna	Number Of Milestone Payments NumberOfMilestonePayments	6	milestone_payment
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4400000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	200000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	200000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	0	USD
CY2020Q2	us-gaap	Sale Of Stock Consideration Received On Transaction SaleOfStockConsiderationReceivedOnTransaction	134600000	USD
CY2018Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	19.18
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	600000	USD
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	700000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	300000	USD
CY2020	cdna	Purchase Of Common Stock Warrants Exercised PurchaseOfCommonStockWarrantsExercised	314000	shares
CY2020	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	400000	USD
CY2020	cdna	Number Of Warrants Exercised Cashless Basis NumberOfWarrantsExercisedCashlessBasis	34000	shares
CY2020	cdna	Stock Issued During Period Shares Cashless Warrants Exercises In Period StockIssuedDuringPeriodSharesCashlessWarrantsExercisesInPeriod	24000	shares
CY2019	cdna	Purchase Of Common Stock Warrants Exercised PurchaseOfCommonStockWarrantsExercised	94000	shares
CY2019	us-gaap	Proceeds From Warrant Exercises ProceedsFromWarrantExercises	100000	USD
CY2019	cdna	Number Of Warrants Exercised Cashless Basis NumberOfWarrantsExercisedCashlessBasis	207400	shares
CY2019	cdna	Stock Issued During Period Shares Cashless Warrants Exercises In Period StockIssuedDuringPeriodSharesCashlessWarrantsExercisesInPeriod	49000	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Additional Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized	1699549	shares
CY2020	cdna	Share Based Compensation Arrangement By Share Based Payment Award Common Stock Awards For Services ShareBasedCompensationArrangementByShareBasedPaymentAwardCommonStockAwardsForServices	11116	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	1082339	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	504775	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2609848	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	16.47
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	1082339	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	29.11
CY2020	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	688818	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	11.58
CY2020	cdna	Share Based Compensation Arrangement By Share Based Payment Award Repurchases Of Common Stock Under Employee Incentive Plans ShareBasedCompensationArrangementByShareBasedPaymentAwardRepurchasesOfCommonStockUnderEmployeeIncentivePlans	169706	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	346656	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	306075	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	306075	shares
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	24.46
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	26896	shares
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	26896	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	672968	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2670398	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	21.92
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	19200000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	15100000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	6800000	USD
CY2020Q4	cdna	Share Based Compensation Arrangement By Share Based Payment Award Options Vested Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedOutstandingNumber	987653	shares
CY2020	cdna	Share Based Compensation Arrangement By Share Based Payment Award Options Vested Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedWeightedAverageExercisePrice	14.64
CY2020	cdna	Share Based Compensation Arrangement By Share Based Payment Award Options Vested Outstanding Weighted Average Remaining Contractual Term ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedOutstandingWeightedAverageRemainingContractualTerm	P6Y5M19D
CY2020Q4	cdna	Share Based Compensation Arrangement By Share Based Payment Award Options Vested Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedOutstandingAggregateIntrinsicValue	57101000	USD
CY2020Q4	cdna	Share Based Compensation Arrangement By Share Based Payment Award Options Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestOutstandingNumber	1553039	shares
CY2020Q4	cdna	Share Based Compensation Arrangement By Share Based Payment Award Options Expected To Vest Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestWeightedAverageExercisePrice	26.16
CY2020	cdna	Share Based Compensation Arrangement By Share Based Payment Award Options Expected To Vest Outstanding Weighted Average Remaining Contractual Term ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestOutstandingWeightedAverageRemainingContractualTerm	P8Y9M3D
CY2020Q4	cdna	Share Based Compensation Arrangement By Share Based Payment Award Options Expected To Vest Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestOutstandingAggregateIntrinsicValue	71883000	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	2540692	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	128984000	USD
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	18.97
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	17.74
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	9.05
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	9000000.0	USD
CY2020Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	23900000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y10M6D
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	23401000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	22417000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	7138000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	0	USD
CY2020	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	0	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-14233000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-19386000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-41109000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-5517000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-4561000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-7106000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-19750000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-23947000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-48215000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-558000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	13000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-58000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-571000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	24000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	160000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	83000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	139000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	103000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-487000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	163000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	91000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-52000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-47000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	4000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-1178000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-887000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-1614000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1139000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1492000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1597000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1036000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1979000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1434000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.135
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.099
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.013
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.344
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.166
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.094
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.018
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.003
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.024
CY2020	cdna	Effective Income Tax Rate Reconciliation Warrant Revaluation EffectiveIncomeTaxRateReconciliationWarrantRevaluation	-0.017
CY2019	cdna	Effective Income Tax Rate Reconciliation Warrant Revaluation EffectiveIncomeTaxRateReconciliationWarrantRevaluation	0.003
CY2018	cdna	Effective Income Tax Rate Reconciliation Warrant Revaluation EffectiveIncomeTaxRateReconciliationWarrantRevaluation	-0.100
CY2020	cdna	Effective Income Tax Rate Reconciliation Interest Expense EffectiveIncomeTaxRateReconciliationInterestExpense	-0.003
CY2019	cdna	Effective Income Tax Rate Reconciliation Interest Expense EffectiveIncomeTaxRateReconciliationInterestExpense	-0.002
CY2018	cdna	Effective Income Tax Rate Reconciliation Interest Expense EffectiveIncomeTaxRateReconciliationInterestExpense	-0.017
CY2020	cdna	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Share Based Compensation Cost Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveShareBasedCompensationCostPercent	-0.068
CY2019	cdna	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Share Based Compensation Cost Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveShareBasedCompensationCostPercent	-0.076
CY2018	cdna	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Share Based Compensation Cost Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveShareBasedCompensationCostPercent	-0.007
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	-0.039
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	-0.026
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	-0.004
CY2020	cdna	Effective Income Tax Rate Reconciliation Changes In Net Operating Loss Carryforwards Percent EffectiveIncomeTaxRateReconciliationChangesInNetOperatingLossCarryforwardsPercent	0.069
CY2019	cdna	Effective Income Tax Rate Reconciliation Changes In Net Operating Loss Carryforwards Percent EffectiveIncomeTaxRateReconciliationChangesInNetOperatingLossCarryforwardsPercent	-0.015
CY2018	cdna	Effective Income Tax Rate Reconciliation Changes In Net Operating Loss Carryforwards Percent EffectiveIncomeTaxRateReconciliationChangesInNetOperatingLossCarryforwardsPercent	0
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.012
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.001
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.003
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.052
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.083
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.030
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	60578000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	56735000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	8507000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	7239000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense DeferredTaxAssetsTaxDeferredExpense	4598000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense DeferredTaxAssetsTaxDeferredExpense	2649000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	1047000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	1078000	USD
CY2020Q4	cdna	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	4408000	USD
CY2019Q4	cdna	Deferred Tax Assets Lease Liability DeferredTaxAssetsLeaseLiability	1015000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	4302000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2224000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	7683000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	7589000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	34000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	11879000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	83440000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	70940000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	72860000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	64412000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	10580000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	6528000	USD
CY2020Q4	cdna	Deferred Tax Liabilities Operating Leases Right Of Use Assets DeferredTaxLiabilitiesOperatingLeasesRightOfUseAssets	3708000	USD
CY2019Q4	cdna	Deferred Tax Liabilities Operating Leases Right Of Use Assets DeferredTaxLiabilitiesOperatingLeasesRightOfUseAssets	878000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	488000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	8501000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1299000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1973000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3164000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	824000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2020	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	8400000	USD
CY2019	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	4100000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Not Subject To Expiration DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration	32600000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3650000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3449000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	667000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	285000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	58000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	466000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4416000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3650000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3449000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	0	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4400000	USD
CY2018Q4	cdna	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Decrease In Valuation Allowance TaxCutsAndJobsActOf2017IncompleteAccountingDecreaseInValuationAllowance	27000000.0	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	192194000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	127068000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	76569000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10704000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	200000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	200000	USD
CY2017Q4	cdna	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Deferred Tax Assets TaxCutsAndJobsActOf2017IncompleteAccountingDeferredTaxAssets	72500000	USD
CY2017Q4	cdna	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Deferred Tax Assets TaxCutsAndJobsActOf2017IncompleteAccountingDeferredTaxAssets	45900000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	4430000	USD
CY2020Q2	cdna	Cares Act Centers For Medicare And Medicaid Services Proceeds From Advance Payment CARESActCentersForMedicareAndMedicaidServicesProceedsFromAdvancePayment	20500000	USD

Files In Submission

Name	View Source	Status
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$CDNA
CareDx Inc Stock $cdna

2020 Q4 Form 10-K Financial Statement

#000121723421000046 Filed on February 24, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CDNA CareDx Inc Stock $cdna

2020 Q4 Form 10-K Financial Statement

#000121723421000046 Filed on February 24, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CDNA
CareDx Inc Stock $cdna