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Debt - Schedule of Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Debt Instrument [Line Items]    
Induced conversion expense $ 2,740 $ 0
Convertible Debt    
Debt Instrument [Line Items]    
Contractual interest expense 1,902 719
Amortization of debt discount 0 2,496
Amortization of debt issuance costs 620 247
Induced conversion expense 2,740 0
Total interest expense 5,262 3,462
Convertible Debt | 2023 Notes    
Debt Instrument [Line Items]    
Contractual interest expense 558 719
Amortization of debt discount 0 2,496
Amortization of debt issuance costs 221 247
Induced conversion expense 2,740 0
Total interest expense 3,519 $ 3,462
Convertible Debt | 2025 Notes    
Debt Instrument [Line Items]    
Contractual interest expense 1,294  
Amortization of debt discount 0  
Amortization of debt issuance costs 319  
Induced conversion expense 0  
Total interest expense 1,613  
Convertible Debt | 2027 Notes    
Debt Instrument [Line Items]    
Contractual interest expense 50  
Amortization of debt discount 0  
Amortization of debt issuance costs 80  
Induced conversion expense 0  
Total interest expense $ 130