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Basis of Presentation and Summary of Significant Accounting Policies - Rollforward of Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance January 1, 2020				$ 0
Issuance of warrants, January 2020				1,636
Settlements from exercise				(52)
Change in fair value of warrant liabilities	$ 0	$ 3,300	$ 0	2,427
Balance June 30, 2020		$ 4,011		$ 4,011

X

- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-SubTopic 10
-Section 25
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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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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.

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Amount of settlements 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.

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Amount of the liabilities, classified as other, for deferred compensation arrangements payable within one year or the operating cycle, if longer.

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