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Fair Value Measurements (Fair Value of Convertible Preferred Stock Warrants) (Details) - Convertible preferred stock warrant liability - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning of the period	$ 3,911	$ 3,540
Change in fair value	13,294	(17)
Conversion to common stock warrants	(17,205)	0
End of the period	$ 0	$ 3,523

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- Definition

Amount of changes in fair value of liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

No definition available.

+ Details

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- Definition

Amount of conversions of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

No definition available.

+ Details

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- 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.

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ 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 (c)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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