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Basis of Presentation and Summary of Significant Accounting Policies - Rollforward (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Accounting Policies [Abstract] |  |  |  |  |  |
Warrant liability |  | $ 4,011 |  | $ 4,011 |  | $ 0
Issuance of warrants, January 2020 | $ 1,636 | 103 |  | 15 |  |
Settlements from exercise |  |  |  | (52) |  |
Loss from change in fair value of warrants |  | $ 3,300 | $ 0 | $ 2,427 | $ 0 |

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