$ACHL
Achilles Therapeutics plc Stock $achl

$achl Overview Financials Valuation SEC Filings Company Website

2023 Q4 Form 20-F Financial Statement

#000095017024041615 Filed on April 04, 2024

Income Statement

Concept	2023 Q4	2023	2022
Revenue	$0.00	$0.00	$0.00
YoY Change
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin	$3.622M	$17.01M	$21.12M
YoY Change	-8.49%	-19.46%	-3.87%
% of Gross Profit
Research & Development	$15.89M	$58.25M	$57.26M
YoY Change	-15.81%	1.72%	35.62%
% of Gross Profit
Depreciation & Amortization	$1.148M	$4.713M	$3.690M
YoY Change	38.15%	27.72%	12.23%
% of Gross Profit
Operating Expenses	$19.51M	$75.26M	$78.38M
YoY Change	-14.54%	-3.99%	22.1%
Operating Profit		-$75.26M	-$78.38M
YoY Change		-3.99%	22.1%
Interest Expense	-$600.0K	-$1.000M	$3.800M
YoY Change	-75.0%	-126.32%	52.0%
% of Operating Profit
Other Income/Expense, Net	$1.989M	$7.081M	$7.318M
YoY Change	63.17%	-3.24%	1056.08%
Pretax Income	-$18.13M	-$69.17M	-$71.07M
YoY Change	-24.53%	-2.66%	16.38%
Income Tax	$505.0K	$491.0K	$111.0K
% Of Pretax Income
Net Earnings	-$18.63M	-$69.67M	-$71.18M
YoY Change	-22.56%	-2.12%	16.49%
Net Earnings / Revenue
Basic Earnings Per Share		-$1.74	-$1.82
Diluted Earnings Per Share	-$0.46	-$1.74	-$1.82
COMMON SHARES
Basic Shares Outstanding	41.08M	39.97M	39.14M
Diluted Shares Outstanding		39.97M	39.14M

Balance Sheet

Concept	2023 Q4	2023	2022
SHORT-TERM ASSETS
Cash & Short-Term Investments	$131.5M	$131.5M	$173.3M
YoY Change	-24.11%	-24.11%	-34.91%
Cash & Equivalents	$131.5M	$131.5M	$173.3M
Short-Term Investments
Other Short-Term Assets	$13.30M	$13.30M	$22.47M
YoY Change	408.64%	-40.81%	26.38%
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$145.6M	$145.6M	$196.6M
YoY Change	-25.92%	-25.92%	-30.96%
LONG-TERM ASSETS
Property, Plant & Equipment	$13.54M	$13.54M	$20.48M
YoY Change	9.23%	-33.87%	-28.87%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$2.280M	$2.280M	$3.298M
YoY Change	-24.35%	-30.87%	-7.52%
Total Long-Term Assets	$15.82M	$15.82M	$23.78M
YoY Change	-33.46%	-33.46%	-26.51%
TOTAL ASSETS
Total Short-Term Assets	$145.6M	$145.6M	$196.6M
Total Long-Term Assets	$15.82M	$15.82M	$23.78M
Total Assets	$161.5M	$161.5M	$220.4M
YoY Change	-26.73%	-26.73%	-30.51%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$5.629M	$5.629M	$5.187M
YoY Change	8.52%	8.52%	39.36%
Accrued Expenses	$10.52M	$10.52M	$11.27M
YoY Change	26.83%	-6.68%	-20.18%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$17.00M	$17.00M	$17.99M
YoY Change	-5.54%	-5.54%	-5.85%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$0.00
YoY Change
Other Long-Term Liabilities	$2.091M	$2.091M	$5.321M
YoY Change	124.12%	-60.7%	-37.16%
Total Long-Term Liabilities	$2.091M	$2.091M	$5.321M
YoY Change	-60.7%	-60.7%	-37.16%
TOTAL LIABILITIES
Total Short-Term Liabilities	$17.00M	$17.00M	$17.99M
Total Long-Term Liabilities	$2.091M	$2.091M	$5.321M
Total Liabilities	$19.09M	$19.09M	$23.31M
YoY Change	-18.13%	-18.13%	-15.46%
SHAREHOLDERS EQUITY
Retained Earnings	-$260.0M
YoY Change	36.63%
Common Stock	$54.00K
YoY Change	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$142.4M	$142.4M	$197.0M
YoY Change
Total Liabilities & Shareholders Equity	$161.5M	$161.5M	$220.4M
YoY Change	-26.73%	-26.73%	-30.51%

Cashflow Statement

Concept	2023 Q4	2023	2022
OPERATING ACTIVITIES
Net Income	-$18.63M	-$69.67M	-$71.18M
YoY Change	-22.56%	-2.12%	16.49%
Depreciation, Depletion And Amortization	$1.148M	$4.713M	$3.690M
YoY Change	38.15%	27.72%	12.23%
Cash From Operating Activities	-$14.19M	-$48.45M	-$59.54M
YoY Change	-26.64%	-18.62%	0.42%
INVESTING ACTIVITIES
Capital Expenditures	$46.00K	$1.100M	$7.512M
YoY Change	-97.72%	-85.36%	-198.4%
Acquisitions
YoY Change
Other Investing Activities
YoY Change
Cash From Investing Activities	-$46.00K	-$1.100M	-$7.512M
YoY Change	-97.72%	-85.36%	-1.6%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$0.00	$9.000K	$1.000K
YoY Change		800.0%	-100.0%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	0.000	9.000K	1.000K
YoY Change		800.0%	-100.0%
NET CHANGE
Cash From Operating Activities	-14.19M	-48.45M	-59.54M
Cash From Investing Activities	-46.00K	-1.100M	-7.512M
Cash From Financing Activities	0.000	9.000K	1.000K
Net Change In Cash	-14.24M	-49.54M	-92.98M
YoY Change	-33.35%	-46.72%	-199.09%
FREE CASH FLOW
Cash From Operating Activities	-$14.19M	-$48.45M	-$59.54M
Capital Expenditures	$46.00K	$1.100M	$7.512M
Free Cash Flow	-$14.24M	-$49.55M	-$67.05M
YoY Change	-33.35%	-26.1%	29.81%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0001830749
CY2022Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2023	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1
CY2022	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1
CY2023	dei	Document Type DocumentType	20-F
CY2023	dei	Document Registration Statement DocumentRegistrationStatement	false
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Document Shell Company Report DocumentShellCompanyReport	false
CY2023	dei	Entity File Number EntityFileNumber	001-40299
CY2023	dei	Entity Registrant Name EntityRegistrantName	Achilles Therapeutics plc
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	X0
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	245 Hammersmith Road
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	London
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	W6 8PW
CY2023	dei	Entity Address Country EntityAddressCountry	GB
CY2023Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	41082948
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Non-accelerated Filer
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	true
CY2023	dei	Entity Ex Transition Period EntityExTransitionPeriod	false
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	false
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Document Accounting Standard DocumentAccountingStandard	U.S. GAAP
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023	dei	Auditor Name AuditorName	KPMG, LLP
CY2023	dei	Auditor Location AuditorLocation	Reading, United Kingdom
CY2023	dei	Auditor Firm AuditorFirmId	1118
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	131539000
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	173338000
CY2023Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	14094000
CY2022Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	23242000
CY2023Q4	us-gaap	Assets Current AssetsCurrent	145633000
CY2022Q4	us-gaap	Assets Current AssetsCurrent	196580000
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	9171000
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	12399000
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	4372000
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	8081000
CY2023Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	41000
CY2022Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	251000
CY2023Q4	us-gaap	Restricted Cash RestrictedCash	33000
CY2022Q4	us-gaap	Restricted Cash RestrictedCash	33000
CY2023Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	2206000
CY2022Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	3014000
CY2023Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	15823000
CY2022Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	23778000
CY2023Q4	us-gaap	Assets Assets	161456000
CY2022Q4	us-gaap	Assets Assets	220358000
CY2023Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	5629000
CY2022Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	5187000
CY2022Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	326000
CY2023Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	7828000
CY2022Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	8292000
CY2023Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	3539000
CY2022Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	4188000
CY2023Q4	us-gaap	Liabilities Current LiabilitiesCurrent	16996000
CY2022Q4	us-gaap	Liabilities Current LiabilitiesCurrent	17993000
CY2023Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	1076000
CY2022Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	4388000
CY2023Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1015000
CY2022Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	933000
CY2023Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	2091000
CY2022Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	5321000
CY2023Q4	us-gaap	Liabilities Liabilities	19087000
CY2022Q4	us-gaap	Liabilities Liabilities	23314000
CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	41082948
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	41082948
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	41082948
CY2022Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	40932727
CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	40932727
CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	40932727
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	54000
CY2022Q4	us-gaap	Common Stock Value CommonStockValue	54000
CY2022Q4	achl	Deferred Shares Par Or Stated Value Per Share DeferredSharesParOrStatedValuePerShare	92451.851
CY2023Q4	achl	Deferred Shares Par Or Stated Value Per Share DeferredSharesParOrStatedValuePerShare	92451.851
CY2023Q4	achl	Deferred Shares Authorized DeferredSharesAuthorized	1
CY2023Q4	achl	Deferred Shares Issued DeferredSharesIssued	1
CY2023Q4	achl	Deferred Shares Outstanding DeferredSharesOutstanding	1
CY2022Q4	achl	Deferred Shares Outstanding DeferredSharesOutstanding	1
CY2022Q4	achl	Deferred Shares Authorized DeferredSharesAuthorized	1
CY2022Q4	achl	Deferred Shares Issued DeferredSharesIssued	1
CY2023Q4	us-gaap	Deferred Compensation Arrangement With Individual Recorded Liability DeferredCompensationArrangementWithIndividualRecordedLiability	128000
CY2022Q4	us-gaap	Deferred Compensation Arrangement With Individual Recorded Liability DeferredCompensationArrangementWithIndividualRecordedLiability	128000
CY2023Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	415210000
CY2022Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	408844000
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-13071000
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-21695000
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-259952000
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-190287000
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	142369000
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	197044000
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	161456000
CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	220358000
CY2023	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	58246000
CY2022	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	57263000
CY2021	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	42224000
CY2023	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	17009000
CY2022	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	21120000
CY2021	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	21971000
CY2023	us-gaap	Operating Expenses OperatingExpenses	75255000
CY2022	us-gaap	Operating Expenses OperatingExpenses	78383000
CY2021	us-gaap	Operating Expenses OperatingExpenses	64195000
CY2023	us-gaap	Operating Income Loss OperatingIncomeLoss	-75255000
CY2022	us-gaap	Operating Income Loss OperatingIncomeLoss	-78383000
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	-64195000
CY2023	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	6081000
CY2022	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	7318000
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3133000
CY2023	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	6081000
CY2022	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	7318000
CY2021	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	3133000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-69174000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-71065000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-61062000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	491000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	111000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	37000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-69665000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	-71176000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-61099000
CY2023	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	8624000
CY2022	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-28331000
CY2021	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-5686000
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-61041000
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-99507000
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-66785000
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.74
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.74
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.82
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.82
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-2.13
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-2.13
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39973059
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39973059
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39139693
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39139693
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	28654760
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	28654760
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	189372000
CY2021	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	160624000
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6317000
CY2021	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-5686000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-61099000
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	289528000
CY2022	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1000
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	7022000
CY2022	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-28331000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	-71176000
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	197044000
CY2023	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	9000
CY2023	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6357000
CY2023	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	8624000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-69665000
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	142369000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-69665000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	-71176000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-61099000
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	4713000
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	3690000
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	3288000
CY2023	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-2000
CY2022	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	10000
CY2021	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-156000
CY2023	us-gaap	Gain Loss On Termination Of Lease GainLossOnTerminationOfLease	45000
CY2023	us-gaap	Asset Impairment Charges AssetImpairmentCharges	16000
CY2022	us-gaap	Asset Impairment Charges AssetImpairmentCharges	7446000
CY2023	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	-231000
CY2022	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	-601000
CY2021	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	-18000
CY2023	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	5000
CY2022	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-50000
CY2021	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-3000
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	6357000
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	7022000
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	6317000
CY2023	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-10109000
CY2022	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	6845000
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	9771000
CY2023	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	257000
CY2022	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	1907000
CY2021	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-2572000
CY2023	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	-326000
CY2022	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	326000
CY2021	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	-7000
CY2023	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-801000
CY2022	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-1114000
CY2021	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	4937000
CY2023	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	33000
CY2022	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	321000
CY2021	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	47000
CY2023	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-210000
CY2022	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	225000
CY2021	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	22000
CY2023	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-927000
CY2022	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	326000
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	543000
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-48449000
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-59535000
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-59284000
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1100000
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7512000
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7634000
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1100000
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-7512000
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-7634000
CY2023	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	9000
CY2022	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1000
CY2021	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	160755000
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	9000
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1000
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	160755000
CY2023	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	7741000
CY2022	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-25935000
CY2021	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-5334000
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-41799000
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-92981000
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	88503000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	173371000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	266352000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	177849000
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	131572000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	173371000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	266352000
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	2108000
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	2111000
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	314000
CY2023	achl	Right Of Use Assets Terminated In Exchange For Operating Lease Liabilities Net RightOfUseAssetsTerminatedInExchangeForOperatingLeaseLiabilitiesNet	-1916000
CY2023	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	540000
CY2022	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	649000
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	726000
CY2023	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	626000
CY2022	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	76000
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	8000
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	131539000
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	173338000
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	266319000
CY2023Q4	us-gaap	Restricted Cash RestrictedCash	33000
CY2022Q4	us-gaap	Restricted Cash RestrictedCash	33000
CY2021Q4	us-gaap	Restricted Cash RestrictedCash	33000
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	131572000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	173371000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	266352000
CY2023	us-gaap	Nature Of Operations NatureOfOperations	<p style="font-size:10pt;margin-top:12pt;font-family:Times New Roman;margin-bottom:0;text-align:justify;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-size:10pt;font-family:Times New Roman;min-width:fit-content;">1. Nature of the business</span></p><p style="font-size:10pt;margin-top:12pt;font-family:Times New Roman;margin-bottom:0;text-align:justify;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;">Achilles Therapeutics plc (formerly Achilles TX Limited) and subsidiaries, or the Company, is a biopharmaceutical company developing AI-powered precision T cell therapies targeting clonal neoantigens to treat solid tumors. The Company is focused on advancing immuno-oncology therapeutics by exploiting its pioneering work in the field of tumor evolution and clonal neoantigens.</span></p><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:justify;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;"> </span></p><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:justify;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;">The Company is a public limited company originally incorporated pursuant to the laws of England and Wales in November 2020 as a private limited company named Achilles TX Limited, with nominal assets and liabilities, for the purposes of becoming the ultimate holding company for Achilles Therapeutics UK Limited (formerly Achilles Therapeutics Limited). Achilles Therapeutics UK Limited was incorporated in May 2016 under the laws of England and Wales and its registered office and principal place of business is currently 245 Hammersmith Road, London W6 8PW. Achilles TX Limited and Achilles Therapeutics Holdings Limited (a wholly owned direct subsidiary of Achilles TX Limited formed in November 2020 for the purpose of becoming the direct holding company of Achilles Therapeutics UK Limited and Achilles Therapeutics US, Inc.) have not conducted any operations prior to the corporate reorganization other than activities incidental to their formation.</span></p><p style="font-size:10pt;margin-top:12pt;font-family:Times New Roman;margin-bottom:0;text-align:justify;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;">The Company has devoted its efforts principally to research and development since formation. The Company has not yet completed product development, filed for or obtained regulatory approvals for any products, nor verified the market acceptance and demand for such products. As a result, the Company is subject to risks that are common to emerging companies in the biotech industry, including the uncertainties of the product discovery and development process, dependence on key individuals, development of the same or similar technological innovations by the Company’s competitors, protection of proprietary technology, compliance with government regulations and approval requirements, the Company’s ability to access capital and uncertainty of market acceptance of products.</span></p><div style="font-size:11pt;font-family:'Calibri',sans-serif;"><p style="font-size:10pt;margin-top:12pt;font-family:Times New Roman;margin-bottom:0;text-align:justify;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-size:10pt;font-family:Times New Roman;font-style:italic;min-width:fit-content;">Going concern</span></p><p style="font-size:10pt;margin-top:10pt;font-family:Times New Roman;margin-bottom:0;text-align:justify;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;">In accordance with the Financial Accounting Standards Board, or FASB, Accounting Standards Update, or ASU, 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern (Subtopic 205-40), the Company has evaluated whether there are conditions and events, considered in the aggregate, that raise substantial doubt about the Company’s ability to continue as a going concern.</span></p><p style="font-size:10pt;margin-top:12pt;font-family:Times New Roman;margin-bottom:0;text-align:justify;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;">The Company has historically been loss making and anticipates that it will continue to incur losses for the foreseeable future and had an accumulated deficit of $</span><span style="font-size:10pt;font-family:Times New Roman;color:#000000;white-space:pre-wrap;min-width:fit-content;">260.0</span><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;"> million as of December 31, 2023. The Company has funded these losses principally through the issuance of ordinary and preferred shares. The Company expects to continue to incur operating losses and negative cash outflows until such time as it generates a level of revenue that is sufficient to support its cost structure.</span></p><p style="font-size:10pt;margin-top:12pt;font-family:Times New Roman;margin-bottom:0;text-align:justify;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;">The Company continues to assess the impact of the disruption of global financial markets, including as a result of global health concerns or pandemics, global economic uncertainty and geo-political events, including the war between Russia and Ukraine and the unrest in the Middle East resulting from the Israel-Hamas war and other global macroeconomic factors such as inflation, increases in commodity prices, energy and fuel prices, credit and capital markets instability and supply chain interruptions could reduce our ability to access capital, which could, in the future, negatively affect our business and the value of our common shares.</span></p><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:justify;"><span style="white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;"> </span></p><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:justify;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;">Geopolitical events, including the ongoing conflict between Russia and Ukraine and the unrest in the Middle East resulting from the Israel-Hamas war, have created global economic uncertainty. This has led to significant increases in commodity prices, energy and fuel prices, credit and capital market instability and supply chain interruptions which have led to increasing inflation. This may in turn adversely impact the Company’s ability to deliver its goals.</span></p><p style="font-size:10pt;margin-top:12pt;font-family:Times New Roman;margin-bottom:0;text-align:justify;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;">As of December 31, 2023, the Company had cash and cash equivalents of $</span><span style="font-size:10pt;font-family:Times New Roman;color:#000000;white-space:pre-wrap;min-width:fit-content;">131.5</span><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;"> million. The Directors have reviewed the financial projections of the Company for the 12 months subsequent to the date of issuance of these financial statements including consideration of severe but plausible scenarios that may affect the Company in that period. These show that the Company will be able to pay (or otherwise discharge) its debts as they fall due immediately following the date of signing of this Balance Sheet and for the period considered by the forecast.</span></p><p style="font-size:10pt;margin-top:12pt;font-family:Times New Roman;margin-bottom:0;text-align:justify;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;">Accordingly, the financial statements have been prepared on a basis that assumes the Company will continue as a going concern and which contemplates the realization of assets and settlement of liabilities and commitments as they fall due in the ordinary course of business for at least 12 months from the date of issuance of the financial statements.</span></p></div>
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-260000000
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	131500000
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-size:10pt;margin-top:12pt;font-family:Times New Roman;margin-bottom:8pt;text-align:justify;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-size:10pt;font-family:Times New Roman;font-style:italic;min-width:fit-content;">Use of estimates</span></p><p style="font-size:10pt;margin-top:12pt;font-family:Times New Roman;margin-bottom:8pt;text-align:justify;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;">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, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting periods. Estimates and assumptions reflected in these financial statements include, but are not limited to, the accrual for research and development expenses, the fair value of share options granted and incremental borrowing rate for leases. Estimates are periodically reviewed in light of changes in circumstances, facts and experience. Changes in estimates are recorded in the period in which they become known. Actual results could differ materially from those estimates.</span></p>
CY2023	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-1000000
CY2022	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	3800000
CY2021	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	2500000
CY2023	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<p style="font-size:10pt;margin-top:12pt;font-family:Times New Roman;margin-bottom:8pt;text-align:justify;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-size:10pt;font-family:Times New Roman;font-style:italic;min-width:fit-content;">Concentrations of credit risk and off-balance sheet risk</span></p><p style="font-size:10pt;margin-top:12pt;font-family:Times New Roman;margin-bottom:8pt;text-align:justify;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;">Financial instruments that subject the Company to credit risk consist solely of cash and cash equivalents. The Company maintains cash balances in excess of amounts insured by the UK Government Financial Services Compensation Scheme in the UK. The Company has no significant off-balance-sheet risk or concentration of credit risk, such as foreign exchange contracts, options contracts, or other foreign hedging arrangements.</span></p>
CY2023Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	0
CY2022Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	0
CY2021Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	0
CY2023Q1	achl	Percentage Of Qualifying Research And Development Expenditure PercentageOfQualifyingResearchAndDevelopmentExpenditure	0.3335
	achl	Percentage Of Qualifying Research And Development Expenditure PercentageOfQualifyingResearchAndDevelopmentExpenditure	0.186
CY2023	achl	New Percentage Of Qualifying Research And Development Expenditure NewPercentageOfQualifyingResearchAndDevelopmentExpenditure	0.2697
CY2023Q4	achl	Cap On Research And Development Claims To Multiple Of Payroll Taxes Maximum Payable Credit CapOnResearchAndDevelopmentClaimsToMultipleOfPayrollTaxesMaximumPayableCredit	20000
CY2023Q4	achl	Research And Development Reliefs Under Small Or Medium Sized Enterprises On Per Project Basis Maximum Aid Limited ResearchAndDevelopmentReliefsUnderSmallOrMediumSizedEnterprisesOnPerProjectBasisMaximumAidLimited	7500000
CY2023Q4	achl	Research And Development Tax Credit Receivable ResearchAndDevelopmentTaxCreditReceivable	9400000
CY2022Q4	achl	Research And Development Tax Credit Receivable ResearchAndDevelopmentTaxCreditReceivable	15600000
CY2021Q4	achl	Research And Development Tax Credit Receivable ResearchAndDevelopmentTaxCreditReceivable	10700000
CY2023Q4	us-gaap	Grants Receivable GrantsReceivable	1000000
CY2022Q4	us-gaap	Grants Receivable GrantsReceivable	400000
CY2021Q4	us-gaap	Grants Receivable GrantsReceivable	100000
CY2023Q4	achl	Research And Development Tax Credit Receivable Current ResearchAndDevelopmentTaxCreditReceivableCurrent	9558000
CY2022Q4	achl	Research And Development Tax Credit Receivable Current ResearchAndDevelopmentTaxCreditReceivableCurrent	15232000
CY2023Q4	achl	Prepaid Research And Development Expenses Current PrepaidResearchAndDevelopmentExpensesCurrent	1074000
CY2022Q4	achl	Prepaid Research And Development Expenses Current PrepaidResearchAndDevelopmentExpensesCurrent	3473000
CY2023Q4	us-gaap	Prepaid Insurance PrepaidInsurance	690000
CY2022Q4	us-gaap	Prepaid Insurance PrepaidInsurance	1151000
CY2023Q4	us-gaap	Value Added Tax Receivable Current ValueAddedTaxReceivableCurrent	793000
CY2022Q4	us-gaap	Value Added Tax Receivable Current ValueAddedTaxReceivableCurrent	771000
CY2023Q4	us-gaap	Other Assets Current OtherAssetsCurrent	1979000
CY2022Q4	us-gaap	Other Assets Current OtherAssetsCurrent	2615000
CY2023Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	14094000
CY2022Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	23242000
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	22086000
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	20253000
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	12915000
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	7854000
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	9171000
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	12399000
CY2023	us-gaap	Depreciation Depreciation	4700000
CY2022	us-gaap	Depreciation Depreciation	3700000
CY2021	us-gaap	Depreciation Depreciation	3300000
CY2023Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	2949000
CY2022Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	2972000
CY2023Q4	achl	Accrued External Research And Development Expenses Current AccruedExternalResearchAndDevelopmentExpensesCurrent	3227000
CY2022Q4	achl	Accrued External Research And Development Expenses Current AccruedExternalResearchAndDevelopmentExpensesCurrent	2188000
CY2023Q4	us-gaap	Accrued Professional Fees Current AccruedProfessionalFeesCurrent	373000
CY2022Q4	us-gaap	Accrued Professional Fees Current AccruedProfessionalFeesCurrent	795000
CY2023Q4	achl	Accrued Property And Equipment Current AccruedPropertyAndEquipmentCurrent	115000
CY2022Q4	achl	Accrued Property And Equipment Current AccruedPropertyAndEquipmentCurrent	217000
CY2023Q4	achl	Accrued Facility Costs AccruedFacilityCosts	314000
CY2022Q4	achl	Accrued Facility Costs AccruedFacilityCosts	910000
CY2023Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	850000
CY2022Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	1210000
CY2023Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	7828000
CY2022Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	8292000
CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
CY2022Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.001
CY2023Q4	us-gaap	Temporary Equity Shares Outstanding TemporaryEquitySharesOutstanding	0
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	P4Y
CY2020Q4	us-gaap	Share Price SharePrice	92451.851
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	1903058
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	6.43
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	356566
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	2.86
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	915817
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	5.29
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	49004
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	3.53
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	1294803
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	4.89
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	383126
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0.95
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	595202
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	6.25
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	243882
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	4.79
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	838845
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	3.92
CY2023Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	2600000
CY2022Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	6100000
CY2023	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y2M12D
CY2022	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y9M18D
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2993641
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	6.18
CY2022	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P8Y6M3D
CY2022Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	150000
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	2453312
CY2023	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	1.15
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	389854
CY2023	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	4.13
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	5057099
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	4.09
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P8Y3M7D
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	232000
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	1388148
CY2023Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	7.36
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P7Y2M8D
CY2023Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	37000
CY2023Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares	3668951
CY2023Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	2.86
CY2023	achl	Share Based Compensation Arrangement By Share Based Payment Award Option Unvested Weighted Average Remaining Contractual Term ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionUnvestedWeightedAverageRemainingContractualTerm	P8Y8M4D
CY2023Q4	achl	Share Based Compensation Arrangement By Share Based Payment Award Options Unvested Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedIntrinsicValue	195000
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0.81
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	2.02
CY2023Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	4800000
CY2023	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y7D
CY2022	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y14D
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.7281
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.6974
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0
CY2023	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0353
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.02
CY2023	achl	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Exercise Prices ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrices	1.19
CY2022	achl	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Exercise Prices ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrices	3.06
CY2023	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	6357000
CY2022	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	7022000
CY2021	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	6317000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	3717000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	1099000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	4816000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	201000
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	4615000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-69329000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-71405000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-61182000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	155000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	340000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	120000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-69174000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-71065000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-61062000
CY2023	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	281000
CY2022	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	337000
CY2021	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	59000
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	281000
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	337000
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	59000
CY2023	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	210000
CY2022	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-226000
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-22000
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	210000
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-226000
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-22000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	491000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	111000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	37000
CY2023	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.235
CY2022	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.1900
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.1900
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.0995
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.0687
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Research And Development EffectiveIncomeTaxRateReconciliationNondeductibleExpenseResearchAndDevelopment	-0.11
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Research And Development EffectiveIncomeTaxRateReconciliationNondeductibleExpenseResearchAndDevelopment	-0.083
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Research And Development EffectiveIncomeTaxRateReconciliationNondeductibleExpenseResearchAndDevelopment	-0.0667
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.0339
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.2358
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.2012
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.0013
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.0566
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.0764
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.0019
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	-0.0013
CY2023	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.0071
CY2022	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.0016
CY2021	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.0028
CY2023Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	30435000
CY2022Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	35121000
CY2021Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	17742000
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	6488000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	4456000
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	2328000
CY2023Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	606000
CY2022Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	7989000
CY2021Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	1311000
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	112000
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2143000
CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	329000
CY2023Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	37641000
CY2022Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	33731000
CY2021Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	19088000
CY2023Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	37600000
CY2022Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	33480000
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	19062000
CY2023Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	41000
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	251000
CY2021Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	26000
CY2023Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	121700000
CY2022Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	140500000
CY2021Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	71000000
CY2022Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	33480000
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	19062000
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	7088000
CY2023	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	2252000
CY2022	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	12731000
CY2021	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	7624000
CY2023	achl	Deferred Tax Asset Exchange Difference DeferredTaxAssetExchangeDifference	1774000
CY2022	achl	Deferred Tax Asset Exchange Difference DeferredTaxAssetExchangeDifference	-2332000
CY2021	achl	Deferred Tax Asset Exchange Difference DeferredTaxAssetExchangeDifference	-313000
CY2023	achl	Deferred Tax Assets Change In Tax Rate DeferredTaxAssetsChangeInTaxRate	94000
CY2022	achl	Deferred Tax Assets Change In Tax Rate DeferredTaxAssetsChangeInTaxRate	4019000
CY2021	achl	Deferred Tax Assets Change In Tax Rate DeferredTaxAssetsChangeInTaxRate	4663000
CY2023Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	37600000
CY2022Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	33480000
CY2021Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	19062000
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Tax Settlements EffectiveIncomeTaxRateReconciliationTaxSettlements	0.50
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0
CY2022Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0
CY2023Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0
CY2022	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	0
CY2023	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	0
CY2021Q2	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.19
CY2023Q2	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.25
CY2023	us-gaap	Net Income Loss NetIncomeLoss	-69665000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	-71176000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	-61099000
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-69665000
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-69665000
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-71176000
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-71176000
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-61099000
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-61099000
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39973059
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39973059
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	39139693
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	39139693
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	28654760
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	28654760
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.74
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.74
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.82
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.82
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-2.13
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-2.13
CY2023	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	5895944
CY2022	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	4288444
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3260905
CY2023Q4	us-gaap	Purchase Obligation PurchaseObligation	3500000
CY2022Q4	us-gaap	Purchase Obligation PurchaseObligation	3800000
CY2022Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	933000
CY2021Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	690000
CY2022	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	168000
CY2023	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	82000
CY2022	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	75000
CY2023Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	1015000
CY2022Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	933000

Files In Submission

Name	View Source	Status
0000950170-24-041615-index-headers.html	Edgar Link	pending
0000950170-24-041615-index.html	Edgar Link	pending
0000950170-24-041615.txt	Edgar Link	pending
0000950170-24-041615-xbrl.zip	Edgar Link	pending
achl-20231231.htm	Edgar Link	pending
achl-20231231.xsd	Edgar Link	pending
achl-ex12_1.htm	Edgar Link	pending
achl-ex12_2.htm	Edgar Link	pending
achl-ex13_1.htm	Edgar Link	pending
achl-ex13_2.htm	Edgar Link	pending
achl-ex15_1.htm	Edgar Link	pending
achl-ex4_7.htm	Edgar Link	pending
achl-ex4_9.htm	Edgar Link	pending
achl-ex8_1.htm	Edgar Link	pending
achl-ex97.htm	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
img131018341_0.jpg	Edgar Link	pending
img44182277_0.jpg	Edgar Link	pending
img44182277_1.jpg	Edgar Link	pending
img44182277_10.jpg	Edgar Link	pending
img44182277_11.jpg	Edgar Link	pending
img44182277_12.jpg	Edgar Link	pending
img44182277_2.jpg	Edgar Link	pending
img44182277_3.jpg	Edgar Link	pending
img44182277_4.jpg	Edgar Link	pending
img44182277_5.jpg	Edgar Link	pending
img44182277_6.jpg	Edgar Link	pending
img44182277_7.jpg	Edgar Link	pending
img44182277_8.jpg	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
achl-20231231_htm.xml	Edgar Link	completed
img44182277_9.jpg	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$ACHL
Achilles Therapeutics plc Stock $achl

2023 Q4 Form 20-F Financial Statement

#000095017024041615 Filed on April 04, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ACHL Achilles Therapeutics plc Stock $achl

2023 Q4 Form 20-F Financial Statement

#000095017024041615 Filed on April 04, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ACHL
Achilles Therapeutics plc Stock $achl