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Balance Sheet Account Detail (Changes in the Fair Value of Level 3 Liabilities) (Details) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Contingently issuable common stock  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance at December 31, 2018 $ 2,200
Retirement due to debt extinguishment 0
Additions 0
Fair value adjustment 100
Balance at June 30, 2019 2,300
Derivative liabilities  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance at December 31, 2018 4,012
Retirement due to debt extinguishment (5,907)
Additions 28,816
Fair value adjustment 1,151
Balance at June 30, 2019 $ 28,072