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DEBT - Convertible Senior Notes (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 07, 2017 USD ($) $ / shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Aug. 01, 2017 $ / shares
Liability component |  |  |  |  |
Principal |  | $ 433,484 | $ 433,484 |  |
Unamortized debt discount and issuance costs |  | (47,967) | (56,364) |  |
Common stock |  |  |  |  |
Debt |  |  |  |  |
Share Price | $ / shares |  |  |  |  | $ 13.28
2025 Notes |  |  |  |  |
Debt |  |  |  |  |
Debt discount |  |  | 67,300 |  |
Convertible senior notes | 2025 Notes |  |  |  |  |
Liability component |  |  |  |  |
Principal |  | 192,500 | 192,500 |  |
Unamortized debt discount and issuance costs |  | (46,766) | (54,597) |  |
Net carrying amount |  | 145,734 | 137,903 |  |
Equity component, net |  | 65,361 | 65,361 |  |
Interest expense |  |  |  |  |
Contractual interest expense |  | 4,813 | 4,813 | $ 4,799 |
Amortization of debt issuance costs |  | 601 | 551 | 505 |
Amortization of debt discount |  | 7,230 | 6,618 | 6,071 |
Total interest and amortization expense |  | $ 12,644 | $ 11,982 | $ 11,375 |
Convertible senior notes | 2025 Notes | Over-Allotment Option |  |  |  |  |
Debt |  |  |  |  |
Loan amount | $ 17,500 |  |  |  |
Convertible senior notes | 2025 Notes | Private Placement |  |  |  |  |
Debt |  |  |  |  |
Loan amount | $ 192,500 |  |  |  |
Interest rate (as a percent) | 2.50% |  |  |  |
Convertible senior notes | 2025 Notes | Common stock |  |  |  |  |
Debt |  |  |  |  |
Conversion rate for shares of common stock per $1,000 principal | 57.9240 |  |  |  |
Conversion price (dollars per share) | $ / shares | $ 17.26 |  |  |  |
Conversion premium (as a percent) | 30.00% |  |  |  |

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