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Fair Value Measures and Disclosures - Mark to Fair Value Adjustment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Mark-to-fair value adjustment on embedded conversion feature $ 0 $ 0 $ 2,010 $ 0
Reclassification of embedded conversion feature to additional paid-in capital     36,952  
Level 3        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value at issuance date     38,962  
3.00% / 5.00% Convertible Senior Secured PIK Toggle Notes Due August 31, 2024 | Level 3 | Convertible Debt        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair value as of December 31, 2019     0  
Mark-to-fair value adjustment on embedded conversion feature     2,010  
Reclassification of embedded conversion feature to additional paid-in capital     (36,952)  
Fair value as of September 30, 2020 $ 0   $ 0