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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 | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 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 |  |  |  | (982)
(Gain) loss from change in fair value of warrants | $ 0 | $ (153) | $ 0 | 2,274
Balance September 30, 2020 |  | $ 2,928 |  | $ 2,928

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- Definition 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. + 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 + Details
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