Fair Value Measurement - Summary of Changes in Fair Value of Level 3 Financial Liabilities on Recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain on revaluation of warrants issued in 2021, June 2020, December 2019, and May 2019 equity financings	$ (3,962)	$ 3,056
Warrant Liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	6,037
Initial fair value of warrants in connection with 2021 financing	1,936
Gain on revaluation of warrants issued in 2021, June 2020, December 2019, and May 2019 equity financings	(3,962)
Reclassification of warrant liability to equity upon exercise of warrants	(2,461)
Ending balance	$ 1,550	$ 6,037

Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Reclassification

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- Definition

Gain (Loss) On Warrant Liability

+ References

No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of issuances 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)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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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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