XML 57 R46.htm IDEA: XBRL DOCUMENT v3.21.2

Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets, Fair Value Disclosure	$ 319,804	$ 68,264
Mutual funds
Assets, Fair Value Disclosure	59,925	33,135
U.S. Treasury notes
Assets, Fair Value Disclosure	229,131	23,309
Money market mutual fund
Assets, Fair Value Disclosure	30,748	11,820
Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure	319,804	68,264
Fair Value, Inputs, Level 1 [Member] | Mutual funds
Assets, Fair Value Disclosure	59,925	33,135
Fair Value, Inputs, Level 1 [Member] | U.S. Treasury notes
Assets, Fair Value Disclosure	229,131	23,309
Fair Value, Inputs, Level 1 [Member] | Money market mutual fund
Assets, Fair Value Disclosure	30,748	11,820
Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member] | Mutual funds
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member] | U.S. Treasury notes
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 [Member] | Money market mutual fund
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Mutual funds
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | U.S. Treasury notes
Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] | Money market mutual fund
Assets, Fair Value Disclosure	$ 0	$ 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=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_MutualFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_USTreasuryNotesSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CashAndCashEquivalentsAxis=us-gaap_MoneyMarketFundsMember
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: