XML 46 R35.htm IDEA: XBRL DOCUMENT v3.21.2
Fair Value Measurement of Assets and Liabilities - Other Financial Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
May 12, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Interest make-whole payment $ 1,300   $ 1,300   $ 4,600
Gain on change in fair value of embedded derivative 1,600   3,400    
Derivative liability extinguished upon debt conversion     100    
2025 Notes          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Value of converted amount   $ 13,500 5,000    
2025 Notes | Convertible Debt          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Carrying amount of debt 161,898   161,898 $ 166,898 $ 180,400
Interest make-whole payment $ 1,317   $ 1,317 $ 4,898