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CONVERTIBLE DEBT - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 02, 2020 USD ($) day $ / shares | Sep. 13, 2019 USD ($) $ / shares | Apr. 01, 2022 USD ($) day $ / shares | Dec. 31, 2021 USD ($) $ / shares | Sep. 25, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.001 | $ 0.001 |
2022 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument principal amount |  |  | $ 37,707 | $ 37,707 |
Fair value of 2022 Notes used to settle 2020 Notes | $ 44,400 |  |  |  |
Unamortized debt discount |  |  |  | 672 |
2022 Notes | Stock price greater or equal 130 percent of note conversion rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument threshold trading days | day |  |  | 20 |  |
Debt instrument threshold consecutive trading days | day |  |  | 30 |  |
2022 Notes | Senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument principal amount | $ 37,700 |  | $ 37,500 |  |
Debt instrument stated percentage (as a percent) | 4.375% |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 |  |  |  |
Debt instrument conversion ratio | 173.9978 |  |  |  |
Debt instrument conversion price (in dollars per share) | $ / shares | $ 5.75 |  |  |  |
Carrying amount of equity component | $ 8,300 |  |  |  |
Convertible debt | 36,000 |  |  |  |
Unamortized debt discount | $ 1,700 |  |  |  |
2022 Notes | Senior notes | Stock price greater or equal 130 percent of note conversion rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument threshold trading days | day | 20 |  |  |  |
Debt instrument threshold consecutive trading days | day | 30 |  |  |  |
Debt instrument threshold percentage of stock price trigger (as a percent) | 130.00% |  | 130.00% |  |
2022 Notes | Senior notes | Note price less than 98 percent of stock price times conversion rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument threshold trading days | day | 5 |  |  |  |
Debt instrument threshold consecutive trading days | day | 5 |  |  |  |
Debt instrument threshold percentage of stock price trigger (as a percent) | 98.00% |  |  |  |
2024 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument principal amount |  |  | $ 115,500 | 115,500 |
Unamortized debt discount |  |  |  | $ 14,576 |
2024 Notes | Senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument principal amount |  | $ 115,500 |  |  |
Debt instrument stated percentage (as a percent) |  | 2.00% |  |  |
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.001 |  |  |
Debt instrument conversion ratio |  | 115.5001 |  |  |
Debt instrument conversion price (in dollars per share) | $ / shares |  | $ 8.66 |  |  |
Carrying amount of equity component |  |  |  |  | $ 24,900

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