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Debt - Schedule of Interest Expense (Details) - Convertible Debt - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Contractual interest expense $ 6,325 $ 2,875
Amortization of debt discount 15,759 9,567
Amortization of issuance costs 1,660 946
Total interest expense 23,744 13,388
2023 Notes    
Debt Instrument [Line Items]    
Contractual interest expense 2,875 2,875
Amortization of debt discount 10,342 9,567
Amortization of issuance costs 1,023 946
Total interest expense 14,240 13,388
2025 Notes    
Debt Instrument [Line Items]    
Contractual interest expense 3,450 0
Amortization of debt discount 5,417 0
Amortization of issuance costs 637 0
Total interest expense $ 9,504 $ 0