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Fair Value Measurements - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - Recurring - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Money market funds	$ 280,099	$ 85,797
Liabilities
Common stock warrant liability	420	447
Fair Value Measured Using - (Level 1)
Assets
Money market funds	280,099	85,797
Liabilities
Common stock warrant liability	0	0
Fair Value Measured Using - (Level 2)
Assets
Money market funds	0	0
Liabilities
Common stock warrant liability	0	0
Fair Value Measured Using - (Level 3)
Assets
Money market funds	0	0
Liabilities
Common stock warrant liability	$ 420	$ 447

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+ References

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- 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

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