Fair Value Measurements - Change in Level 3 (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ||||
| Gain on revaluation of warrants issued in connection with the February 2021, June 2020, December 2019 and May 2019 financings | $ (1,125) | $ (4,476) | $ (2,011) | $ 1,579 |
| 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 connection with the February 2021, June 2020, December 2019 and May 2019 financings | (2,011) | |||
| Reclassification of warrant liability to equity upon exercise of warrants | (2,461) | |||
| Ending balance | $ 3,501 | $ 3,501 | ||
| X | ||||||||||
- Definition Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Reclassification No definition available.
|
| X | ||||||||||
- Definition Gain (Loss) On Warrant Liability No definition available.
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|