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Balance Sheet Account Detail - Changes in the Fair Value of Level 3 Liabilities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Contingently issuable common stock  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at December 31, 2018 $ 2,200
Additions 0
Fair value adjustment (1,700)
Balance at December 31, 2019 500
Derivative liabilities  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at December 31, 2018 4,012
Additions 14,641
Fair value adjustment (17,713)
Balance at December 31, 2019 $ 940