XML 42 R31.htm IDEA: XBRL DOCUMENT
v3.21.2

Fair Value Measurements (Details) - Recurring - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Assets, fair value | $ 170,964 | $ 187,817
Liabilities: |  |
Liabilities, fair value | 663 | 1,376
Derivative liability for Exit Fee |  |
Liabilities: |  |
Liabilities, fair value | 663 | 1,376
Money market funds |  |
Assets: |  |
Assets, fair value | 84,650 | 88,151
Commercial paper |  |
Assets: |  |
Assets, fair value | 63,975 | 62,729
Corporate bonds |  |
Assets: |  |
Assets, fair value | 16,964 | 26,658
Asset-backed securities |  |
Assets: |  |
Assets, fair value | 5,375 |
U.S. government-sponsored agency bonds |  |
Assets: |  |
Assets, fair value |  | 9,279
U.S. treasury notes |  |
Assets: |  |
Assets, fair value |  | 1,000
Level 1 |  |
Assets: |  |
Assets, fair value | 84,650 | 88,151
Liabilities: |  |
Liabilities, fair value | 0 | 0
Level 1 | Derivative liability for Exit Fee |  |
Liabilities: |  |
Liabilities, fair value | 0 | 0
Level 1 | Money market funds |  |
Assets: |  |
Assets, fair value | 84,650 | 88,151
Level 1 | Commercial paper |  |
Assets: |  |
Assets, fair value | 0 | 0
Level 1 | Corporate bonds |  |
Assets: |  |
Assets, fair value | 0 | 0
Level 1 | Asset-backed securities |  |
Assets: |  |
Assets, fair value | 0 |
Level 1 | U.S. government-sponsored agency bonds |  |
Assets: |  |
Assets, fair value |  | 0
Level 1 | U.S. treasury notes |  |
Assets: |  |
Assets, fair value |  | 0
Level 2 |  |
Assets: |  |
Assets, fair value | 86,314 | 99,666
Liabilities: |  |
Liabilities, fair value | 0 | 0
Level 2 | Derivative liability for Exit Fee |  |
Liabilities: |  |
Liabilities, fair value | 0 | 0
Level 2 | Money market funds |  |
Assets: |  |
Assets, fair value | 0 | 0
Level 2 | Commercial paper |  |
Assets: |  |
Assets, fair value | 63,975 | 62,729
Level 2 | Corporate bonds |  |
Assets: |  |
Assets, fair value | 16,964 | 26,658
Level 2 | Asset-backed securities |  |
Assets: |  |
Assets, fair value | 5,375 |
Level 2 | U.S. government-sponsored agency bonds |  |
Assets: |  |
Assets, fair value |  | 9,279
Level 2 | U.S. treasury notes |  |
Assets: |  |
Assets, fair value |  | 1,000
Level 3 |  |
Assets: |  |
Assets, fair value | 0 | 0
Liabilities: |  |
Liabilities, fair value | 663 | 1,376
Level 3 | Derivative liability for Exit Fee |  |
Liabilities: |  |
Liabilities, fair value | 663 | 1,376
Level 3 | Money market funds |  |
Assets: |  |
Assets, fair value | 0 | 0
Level 3 | Commercial paper |  |
Assets: |  |
Assets, fair value | 0 | 0
Level 3 | Corporate bonds |  |
Assets: |  |
Assets, fair value | 0 | 0
Level 3 | Asset-backed securities |  |
Assets: |  |
Assets, fair value | $ 0 |
Level 3 | U.S. government-sponsored agency bonds |  |
Assets: |  |
Assets, fair value |  | 0
Level 3 | U.S. treasury notes |  |
Assets: |  |
Assets, fair value |  | $ 0

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |