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Fair Value of Financial Assets and Liabilities - Roll Forward of Aggregate Fair Value Determined by Level 3 Inputs (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Roll forward of aggregate fair value determined by Level 3 inputs  
Balance at beginning of period $ 37,690
Change in fair value 5,781
Partial settlement of derivative liability (42,821)
Balance at end of period $ 650