XML 54 R42.htm IDEA: XBRL DOCUMENT
v3.19.1

Available-for-sale debt securities (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) security | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |  |
Realized loss on available-for-sale debt securities | $ 0 | $ 1,163,000 |
Fair market value of investments in an unrealized loss position | $ 49,567,000 |  | $ 117,179,000
Number of debt securities | security | 15 |  | 37
Number of available-for-sale securities in an unrealized loss position for more than one year | security | 0 |  |
Cash equivalents |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | $ 7,990,000 |  |
Aggregate estimated fair value | 7,990,000 |  |
Marketable securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | 118,187,000 |  |
Gross unrealized gains | 69,000 |  |
Gross unrealized losses | (15,000) |  |
Aggregate estimated fair value | 118,241,000 |  |
Corporate Debt Securities Maturity Period Less Than Three Months | Cash equivalents |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | 7,990,000 |  |
Aggregate estimated fair value | 7,990,000 |  |
Corporate Debt Securities Maturity Period Three Months To One Year | Marketable securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | 109,203,000 |  |
Gross unrealized gains | 64,000 |  |
Gross unrealized losses | (15,000) |  |
Aggregate estimated fair value | 109,252,000 |  |
Agency Bond Maturity Period Three Months To One Year |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | 3,990,000 |  |
Gross unrealized gains | 5,000 |  |
Aggregate estimated fair value | 3,995,000 |  |
Treasury Bills Maturity Period Three Months To One Year |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | 1,992,000 |  |
Aggregate estimated fair value | 1,992,000 |  |
Certificate of Deposit Maturity Period Three Months To One Year |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost | 3,002,000 |  |
Aggregate estimated fair value | $ 3,002,000 |  |
Minimum | Corporate Debt Securities Maturity Period Three Months To One Year | Marketable securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available For Sale Securities Debt Maturity Period | 3 months |  |
Minimum | Agency Bond Maturity Period Three Months To One Year | Marketable securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available For Sale Securities Debt Maturity Period | 3 months |  |
Minimum | Treasury Bills Maturity Period Three Months To One Year | Marketable securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available For Sale Securities Debt Maturity Period | 3 months |  |
Minimum | Certificate of Deposit Maturity Period Three Months To One Year | Marketable securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available For Sale Securities Debt Maturity Period | 3 months |  |
Maximum | Corporate Debt Securities Maturity Period Three Months To One Year | Marketable securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available For Sale Securities Debt Maturity Period | 1 year |  |
Maximum | Agency Bond Maturity Period Three Months To One Year | Marketable securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available For Sale Securities Debt Maturity Period | 1 year |  |
Maximum | Treasury Bills Maturity Period Three Months To One Year | Marketable securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available For Sale Securities Debt Maturity Period | 1 year |  |
Maximum | Certificate of Deposit Maturity Period Three Months To One Year | Marketable securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available For Sale Securities Debt Maturity Period | 1 year |  |

X
- Definition Information pertains to maturity period of corporate debt securities + References No definition available. + Details
Name: | adap_AvailableForSaleSecuritiesDebtMaturityPeriod
Namespace Prefix: | adap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. + References No definition available. + Details
Name: | adap_NumberOfDebtSecuritiesAvailableForSaleUnrealizedLossPosition
Namespace Prefix: | adap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
Name: | us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_CashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=adap_MarketableSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=adap_CorporateDebtSecuritiesMaturityPeriodLessThanThreeMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=adap_CorporateDebtSecuritiesMaturityPeriodThreeMonthsToOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=adap_AgencyBondMaturityPeriodThreeMonthsToOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=adap_TreasuryBillsMaturityPeriodThreeMonthsToOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=adap_CertificateOfDepositMaturityPeriodThreeMonthsToOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |