XML 49 R34.htm IDEA: XBRL DOCUMENT
v3.20.2

Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Details) - Fair Value Measurements Recurring - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Total | $ 280,755 | $ 131,664
Level 1 |  |
Assets: |  |
Total | 63,893 | 3,151
Level 2 |  |
Assets: |  |
Total | 216,862 | 128,513
Money Market Funds |  |
Assets: |  |
Total | 63,893 | 3,151
Money Market Funds | Level 1 |  |
Assets: |  |
Total | 63,893 | 3,151
Commercial Paper |  |
Assets: |  |
Total | 40,182 | 4,952
Commercial Paper | Level 2 |  |
Assets: |  |
Total | 40,182 | 4,952
Corporate Debt Securities |  |
Assets: |  |
Total | 42,480 | 69,499
Corporate Debt Securities | Level 2 |  |
Assets: |  |
Total | 42,480 | 69,499
Equity Securities |  |
Assets: |  |
Total | 78,872 |
Equity Securities | Level 2 |  |
Assets: |  |
Total | 78,872 |
Asset-backed Securities |  |
Assets: |  |
Total | 8,647 | 27,055
Asset-backed Securities | Level 2 |  |
Assets: |  |
Total | 8,647 | 27,055
U.S. Government Agency Securities |  |
Assets: |  |
Total | 46,681 | 27,007
U.S. Government Agency Securities | Level 2 |  |
Assets: |  |
Total | $ 46,681 | $ 27,007

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=117815213&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
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
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_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_EquitySecuritiesMember
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_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |