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Basis of Presentation and Summary of Significant Accounting Policies - Rollforward (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
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 | $ (153) | $ 0 | 2,274 | $ 0
Balance September 30, 2020 | $ 2,928 |  | $ 2,928 |

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