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Debt - Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Term Loan | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual interest expense | $ 516 | $ 1,210 | $ 1,667 | $ 2,390
Amortization of debt discount | 526 | 333 | 859 | 666
Amortization of debt issuance costs | 63 | 40 | 103 | 80
Total interest expense | 1,105 | 1,583 | 2,629 | 3,136
2025 Notes | Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual interest expense | 800 |  | 800 |
Amortization of debt discount | 124 |  | 124 |
Amortization of debt issuance costs | 96 |  | 96 |
Total interest expense | 1,020 |  | 1,020 |
2022 Notes | Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual interest expense | 286 | 1,445 | 768 | 2,891
Amortization of debt discount | 700 | 1,955 | 1,952 | 3,911
Amortization of debt issuance costs | 39 | 115 | 111 | 229
Total interest expense | $ 1,025 | $ 3,515 | $ 2,831 | $ 7,031

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