$CSTL
CASTLE BIOSCIENCES INC Stock $cstl

$cstl Overview Financials Valuation SEC Filings Company Website

2019 Q2 Form 10-Q Financial Statement

#000144736219000011 Filed on September 03, 2019

Income Statement

Concept	2019 Q2	2018 Q4	2018 Q2
Revenue	$10.74M	$11.44M	$3.979M
YoY Change	169.89%
Cost Of Revenue	$1.993M	$1.370M	$1.327M
YoY Change	50.21%
Gross Profit	$8.746M	$10.07M	$2.652M
YoY Change	229.79%
Gross Profit Margin	81.44%	88.06%	66.65%
Selling, General & Admin	$6.821M	$4.080M	$4.160M
YoY Change	63.98%
% of Gross Profit	77.99%	40.52%	156.85%
Research & Development	$1.317M	$1.140M	$1.159M
YoY Change	13.61%
% of Gross Profit	15.06%	11.32%	43.71%
Depreciation & Amortization	$86.00K	$80.00K	$71.08K
YoY Change	20.99%
% of Gross Profit	0.98%	0.79%	2.68%
Operating Expenses	$8.138M	$5.300M	$5.319M
YoY Change	53.0%
Operating Profit	$608.0K	$4.770M	-$2.666M
YoY Change	-122.8%
Interest Expense	$1.693M	-$650.0K	$524.8K
YoY Change	222.57%
% of Operating Profit	278.45%	-13.63%
Other Income/Expense, Net	-$189.0K	-$240.0K	$34.04K
YoY Change	-655.26%
Pretax Income	-$1.270M	$3.880M	-$3.150M
YoY Change	-59.68%
Income Tax	$0.00	$10.00K	$0.00
% Of Pretax Income		0.26%
Net Earnings	-$1.269M	$3.868M	-$3.155M
YoY Change	-59.78%
Net Earnings / Revenue	-11.82%	33.82%	-79.29%
Basic Earnings Per Share	-$1.05	$1.49	-$2.15
Diluted Earnings Per Share	-$1.05	$0.38	-$2.15
COMMON SHARES
Basic Shares Outstanding	2.153M shares
Diluted Shares Outstanding	2.153M shares

Balance Sheet

Concept	2019 Q2	2018 Q4	2018 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$17.50M
YoY Change
Cash & Equivalents	$17.47M	$4.479M	$5.205M
Short-Term Investments
Other Short-Term Assets	$800.0K
YoY Change
Inventory	$550.9K	$882.0K
Prepaid Expenses
Receivables	$9.730M	$12.09M
Other Receivables	$0.00
Total Short-Term Assets	$28.52M	$18.13M
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$1.743M	$1.529M
YoY Change
Goodwill
YoY Change
Intangibles	$0.00	$4.000K
YoY Change
Long-Term Investments
YoY Change
Other Assets	$1.813M	$214.0K
YoY Change
Total Long-Term Assets	$4.823M	$4.279M
YoY Change
TOTAL ASSETS
Total Short-Term Assets	$28.52M	$18.13M
Total Long-Term Assets	$4.823M	$4.279M
Total Assets	$33.35M	$22.41M
YoY Change
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$2.085M	$1.451M
YoY Change
Accrued Expenses	$4.400M
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$4.426M	$0.00
YoY Change
Long-Term Debt Due	$833.3K	$0.00
YoY Change
Total Short-Term Liabilities	$11.75M	$6.737M
YoY Change
LONG-TERM LIABILITIES
Long-Term Debt	$23.86M	$24.50M
YoY Change
Other Long-Term Liabilities	$1.300M
YoY Change
Total Long-Term Liabilities	$23.86M	$24.50M
YoY Change
TOTAL LIABILITIES
Total Short-Term Liabilities	$11.75M	$6.737M
Total Long-Term Liabilities	$23.86M	$24.50M
Total Liabilities	$36.94M	$32.48M
YoY Change
SHAREHOLDERS EQUITY
Retained Earnings	-$60.10M	-$57.49M
YoY Change
Common Stock
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	-$50.20M	-$56.57M	-$57.05M
YoY Change
Total Liabilities & Shareholders Equity	$33.35M	$22.41M
YoY Change

Cashflow Statement

Concept	2019 Q2	2018 Q4	2018 Q2
OPERATING ACTIVITIES
Net Income	-$1.269M	$3.868M	-$3.155M
YoY Change	-59.78%
Depreciation, Depletion And Amortization	$86.00K	$80.00K	$71.08K
YoY Change	20.99%
Cash From Operating Activities	$480.0K	-$3.210M	-$4.700M
YoY Change	-110.21%
INVESTING ACTIVITIES
Capital Expenditures	-$180.0K	-$10.00K	-$150.0K
YoY Change	20.0%
Acquisitions
YoY Change
Other Investing Activities
YoY Change
Cash From Investing Activities	-$180.0K	-$10.00K	-$150.0K
YoY Change	20.0%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	930.0K	4.420M	6.030M
YoY Change	-84.58%
NET CHANGE
Cash From Operating Activities	480.0K	-3.210M	-4.700M
Cash From Investing Activities	-180.0K	-10.00K	-150.0K
Cash From Financing Activities	930.0K	4.420M	6.030M
Net Change In Cash	1.230M	1.200M	1.180M
YoY Change	4.24%
FREE CASH FLOW
Cash From Operating Activities	$480.0K	-$3.210M	-$4.700M
Capital Expenditures	-$180.0K	-$10.00K	-$150.0K
Free Cash Flow	$660.0K	-$3.200M	-$4.550M
YoY Change	-114.51%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2018Q4	cstl	Class Of Warrant Or Right Exercised ClassOfWarrantOrRightExercised	219243	shares
CY2019Q2	cstl	Class Of Warrant Or Right Exercised ClassOfWarrantOrRightExercised	219243	shares
CY2018Q4	cstl	Class Of Warrant Or Right Expired ClassOfWarrantOrRightExpired	11682	shares
CY2019Q2	cstl	Class Of Warrant Or Right Expired ClassOfWarrantOrRightExpired	11682	shares
	cstl	Contract With Customer Customer Payment Terms ContractWithCustomerCustomerPaymentTerms	P30D
	cstl	Increase Decreasein Deferred Lease Liability IncreaseDecreaseinDeferredLeaseLiability	28249	USD
	cstl	Increase Decreasein Deferred Lease Liability IncreaseDecreaseinDeferredLeaseLiability	13103	USD
	cstl	Offering Costs And Debt Issuance Costs Incurred But Not Yet Paid OfferingCostsAndDebtIssuanceCostsIncurredButNotYetPaid	0	USD
	cstl	Offering Costs And Debt Issuance Costs Incurred But Not Yet Paid OfferingCostsAndDebtIssuanceCostsIncurredButNotYetPaid	1204850	USD
	cstl	Revenue From Contract With Customer Revenue Not Yet Recognized Number Of Claims In Adjudication Process RevenueFromContractWithCustomerRevenueNotYetRecognizedNumberOfClaimsInAdjudicationProcess	2698	claim
CY2018Q2	cstl	Temporary Equity Stock Issued During Period Shares New Issues TemporaryEquityStockIssuedDuringPeriodSharesNewIssues	868959	shares
	cstl	Temporary Equity Stock Issued During Period Shares New Issues TemporaryEquityStockIssuedDuringPeriodSharesNewIssues	1809564	shares
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4167	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	286798	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	1249964	USD
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	9868526	shares
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-38209	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	99323	USD
	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	1000000	USD
	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	0	USD
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q2
CY2018Q4	us-gaap	Accrued Royalties Current AccruedRoyaltiesCurrent	239751	USD
	dei	Document Period End Date DocumentPeriodEndDate	2019-06-30
	dei	Document Type DocumentType	10-Q
	dei	Entity Central Index Key EntityCentralIndexKey	0001447362
CY2019Q3	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	17069094	shares
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	No
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	true
	dei	Entity Ex Transition Period EntityExTransitionPeriod	false
	dei	Entity Filer Category EntityFilerCategory	Non-accelerated Filer
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Registrant Name EntityRegistrantName	CASTLE BIOSCIENCES INC
	dei	Entity Shell Company EntityShellCompany	false
	dei	Entity Small Business EntitySmallBusiness	true
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CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	12089719	USD
CY2019Q2	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	9730319	USD
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CY2019Q2	us-gaap	Liabilities Liabilities	36940985	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	22404935	USD
CY2019Q2	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	33347143	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	6737021	USD
CY2019Q2	us-gaap	Liabilities Current LiabilitiesCurrent	11745674	USD
CY2018Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2019Q2	us-gaap	Long Term Debt Current LongTermDebtCurrent	833333	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	24499752	USD
CY2019Q2	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	23858781	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	11383572	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	11644229	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-184610	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-424473	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-7205723	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1770198	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	-3154975	USD
	us-gaap	Net Income Loss NetIncomeLoss	-6785414	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	-1269079	USD
	us-gaap	Net Income Loss NetIncomeLoss	-2627062	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-4079778	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-8568764	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-2264746	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-4607102	USD
CY2018Q4	us-gaap	Notes Payable Related Parties Classified Current NotesPayableRelatedPartiesClassifiedCurrent	0	USD
CY2019Q2	us-gaap	Notes Payable Related Parties Classified Current NotesPayableRelatedPartiesClassifiedCurrent	4755882	USD
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1	segment
CY2018Q2	us-gaap	Operating Expenses OperatingExpenses	5318952	USD
	us-gaap	Operating Expenses OperatingExpenses	10809433	USD
CY2019Q2	us-gaap	Operating Expenses OperatingExpenses	8138164	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	-5751309	USD
CY2018Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	675562	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-2666410	USD
CY2019Q2	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	774885	USD
	us-gaap	Proceeds From Issuance Of Preferred Stock Preference Stock And Warrants ProceedsFromIssuanceOfPreferredStockPreferenceStockAndWarrants	10382507	USD
	us-gaap	Proceeds From Issuance Of Preferred Stock Preference Stock And Warrants ProceedsFromIssuanceOfPreferredStockPreferenceStockAndWarrants	0	USD
	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	0	USD
	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	1776145	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	607621	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	286177	USD
CY2018Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	715244	USD
CY2019Q2	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	1616866	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	213735	USD
CY2019Q2	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	1813311	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	0	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-337	USD
CY2018Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	34038	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	13340	USD
CY2019Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-189647	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-222575	USD
CY2018Q4	us-gaap	Other Sundry Liabilities Current OtherSundryLiabilitiesCurrent	0	USD
CY2019Q2	us-gaap	Other Sundry Liabilities Current OtherSundryLiabilitiesCurrent	3492	USD
	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	0	USD
	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	453816	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	184610	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	424473	USD
	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	0	USD
	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	11695495	USD
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1065	USD
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	417550	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2438381	USD
CY2019Q2	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	2755141	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1528996	USD
CY2019Q2	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1743170	USD
	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	0	USD
	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	1791145	USD
CY2018Q2	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	1159197	USD
	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	2421887	USD
CY2019Q2	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	1317237	USD
	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	2711088	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-57488578	USD
CY2019Q2	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-60115640	USD
CY2019Q2	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-60100000	USD
CY2018Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3979381	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	7637946	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	10738569	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	19455556	USD
CY2018Q2	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	4159755	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	8387546	USD
CY2019Q2	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	6820927	USD
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	12867549	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	146340	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	307229	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	1.35
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	1.95
CY2018Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	0	USD
CY2019Q2	us-gaap	Short Term Borrowings ShortTermBorrowings	4425819	USD
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1065	USD
CY2019Q2	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	416634	USD
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	417550	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	-50310505	USD
CY2018Q1	us-gaap	Stockholders Equity StockholdersEquity	-53927397	USD
CY2018Q2	us-gaap	Stockholders Equity StockholdersEquity	-57053534	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	-56565302	USD
CY2019Q1	us-gaap	Stockholders Equity StockholdersEquity	-49432154	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	-50202566	USD
CY2018Q2	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	55795	USD
	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	105020	USD
CY2019Q2	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	56775	USD
	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	112573	USD
CY2018Q2	us-gaap	Temporary Equity Dividends Adjustment TemporaryEquityDividendsAdjustment	869008	USD
	us-gaap	Temporary Equity Dividends Adjustment TemporaryEquityDividendsAdjustment	1678330	USD
CY2019Q2	us-gaap	Temporary Equity Dividends Adjustment TemporaryEquityDividendsAdjustment	938892	USD
	us-gaap	Temporary Equity Dividends Adjustment TemporaryEquityDividendsAdjustment	1867467	USD
CY2018Q2	us-gaap	Temporary Equity Stock Issued During Period Value New Issues TemporaryEquityStockIssuedDuringPeriodValueNewIssues	5022592	USD
	us-gaap	Temporary Equity Stock Issued During Period Value New Issues TemporaryEquityStockIssuedDuringPeriodValueNewIssues	9990482	USD
CY2018Q4	us-gaap	Warrants And Rights Outstanding WarrantsAndRightsOutstanding	1193726	USD
CY2019Q2	us-gaap	Warrants And Rights Outstanding WarrantsAndRightsOutstanding	1279840	USD
CY2018Q2	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	1897084	shares
	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	1897070	shares
CY2019Q2	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	2152965	shares
	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	2035393	shares
	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:8px;padding-top:8px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;color:#231f20;">A majority of the Company’s cash and cash equivalents are deposited with a single financial institution. </font></div></div>
	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:8px;padding-top:8px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;color:#231f20;">The preparation of 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 as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant items subject to such estimates include revenue recognition, the determination of fair value of the Company’s preferred stock warrants and convertible debt embedded derivatives, the valuation of stock options, assessing future tax exposure and the realization of deferred tax assets, the useful lives and recoverability of property and equipment, and contingent liabilities. The Company bases these estimates on historical and anticipated results, trends, and various other assumptions that the Company believes are reasonable under the circumstances, including assumptions as to future events. These estimates form the basis for making judgments about the carrying values of assets and liabilities and recorded revenues and expenses that are not readily apparent from other sources. Actual results could differ from those estimates and assumptions.</font></div></div>

Files In Submission

Name	View Source	Status
0001447362-19-000011-index-headers.html	Edgar Link	pending
0001447362-19-000011-index.html	Edgar Link	pending
0001447362-19-000011.txt	Edgar Link	pending
0001447362-19-000011-xbrl.zip	Edgar Link	pending
a630201910-q.htm	Edgar Link	pending
cstl-20190630.xml	Edgar Link	completed
cstl-20190630.xsd	Edgar Link	pending
cstl-20190630_cal.xml	Edgar Link	unprocessable
cstl-20190630_def.xml	Edgar Link	unprocessable
cstl-20190630_lab.xml	Edgar Link	unprocessable
cstl-20190630_pre.xml	Edgar Link	unprocessable
exhibit311q22019.htm	Edgar Link	pending
exhibit312q22019.htm	Edgar Link	pending
exhibit321q22019.htm	Edgar Link	pending
exhibit322q22019.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
R1.htm	Edgar Link	pending
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R11.htm	Edgar Link	pending
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R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$CSTL
CASTLE BIOSCIENCES INC Stock $cstl

2019 Q2 Form 10-Q Financial Statement

#000144736219000011 Filed on September 03, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CSTL CASTLE BIOSCIENCES INC Stock $cstl

2019 Q2 Form 10-Q Financial Statement

#000144736219000011 Filed on September 03, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CSTL
CASTLE BIOSCIENCES INC Stock $cstl