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CONVERTIBLE DEBT - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 02, 2020 USD ($) d $ / shares | Sep. 13, 2019 USD ($) $ / shares | Jul. 01, 2022 USD ($) d $ / 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 |  |  | $ 0 | 672 |
2022 Notes | Stock Price Greater or Equal 130 Percent of Note Conversion Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument threshold trading days | d |  |  | 20 |  |
Debt instrument threshold consecutive trading days | d |  |  | 30 |  |
2022 Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument stated percentage (as a percent) | 4.375% |  |  |  |
Debt instrument principal amount | $ 37,700 |  | $ 37,600 |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 |  |  |  |
Debt instrument conversion ratio | 0.1739978 |  |  |  |
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 | d | 20 |  |  |  |
Debt instrument threshold consecutive trading days | d | 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 | d | 5 |  |  |  |
Debt instrument threshold consecutive trading days | d | 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 |  |  | $ 0 | $ 14,576 |
2024 Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument stated percentage (as a percent) |  | 2.00% |  |  |
Debt instrument principal amount |  | $ 115,500 |  |  |
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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