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Debt - Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Term Loan | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual interest expense | $ 0 | $ 516 | $ 0 | $ 1,667
Amortization of debt discount | 0 | 526 | 0 | 859
Amortization of debt issuance costs | 0 | 63 | 0 | 103
Total interest expense | 0 | 1,105 | 0 | 2,629
2025 Notes | Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual interest expense | 1,315 | 800 | 2,584 | 800
Amortization of debt discount | 207 | 124 | 415 | 124
Amortization of debt issuance costs | 165 | 96 | 330 | 96
Total interest expense | 1,687 | 1,020 | 3,329 | 1,020
2022 Notes | Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual interest expense | 0 | 286 | 0 | 768
Amortization of debt discount | 0 | 700 | 0 | 1,952
Amortization of debt issuance costs | 0 | 39 | 0 | 111
Total interest expense | $ 0 | $ 1,025 | $ 0 | $ 2,831

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