Cash, Cash Equivalents and Investments - Narrative (Details)	3 Months Ended	9 Months Ended
Sep. 30, 2021 USD ($) investment	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) investment	Sep. 30, 2020 USD ($)
Cash and Cash Equivalents [Abstract]
Other-than-temporary impairment \| $	$ 0	$ 0	$ 0	$ 0
Investment in continuous unrealized loss position for more than one year \| investment	0		0

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455

Name:	us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant