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Convertible Senior Notes - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Line of Credit Facility [Line Items]    
Amortization of debt discount and issuance costs $ 2,870 $ 285
Senior Notes Due 2025 | Convertible Notes Payable    
Line of Credit Facility [Line Items]    
Contractual interest expense 1,437  
Amortization of debt discount and issuance costs 2,870  
Total $ 4,307