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Fair Value Measurements - Fair Value Measurements Using Significant Unobservable Inputs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward]    
Beginning balance $ 33 $ 560
Fair value of warrants issued 20,844 23,533
Total change in the liability included in earnings (17,498) (19,706)
Reclass from liability to equity (11) (4,210)
Fair value of warrants exchanged   (144)
Ending balance $ 3,368 $ 33