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Debt - Schedule of Interest Expense (Details) - Convertible Debt - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Debt Instrument [Line Items]        
Contractual interest expense $ 2,011 $ 719 $ 4,312 $ 2,156
Amortization of debt discount 4,668 2,437 11,000 7,082
Amortization of issuance costs 501 242 1,151 701
Total interest expense 7,180 3,398 16,463 9,939
2023 Notes        
Debt Instrument [Line Items]        
Contractual interest expense 718 719 2,156 2,156
Amortization of debt discount 2,627 2,437 7,666 7,082
Amortization of issuance costs 260 242 758 701
Total interest expense 3,605 3,398 10,580 9,939
2025 Notes        
Debt Instrument [Line Items]        
Contractual interest expense 1,293 0 2,156 0
Amortization of debt discount 2,041 0 3,334 0
Amortization of issuance costs 241 0 393 0
Total interest expense $ 3,575 $ 0 $ 5,883 $ 0