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DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Details) - USD ($) | Mar. 31, 2022 | Jan. 01, 2022 | Dec. 31, 2021 | Mar. 12, 2021 | Mar. 01, 2021 | Mar. 09, 2020
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Additional paid in capital | $ (666,511,000) |  | $ (837,924,000) |  |  |
Accumulated deficit | $ 328,206,000 |  | $ 405,737,000 |  |  |
Notes due 2028 | Convertible Notes |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Debt instrument face amount |  |  |  |  | $ 575,000,000 |
Interest rate |  |  |  |  | 0.00% |
Total Convertible Senior Notes Due 2026 | Convertible Notes |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Debt instrument face amount |  |  |  | $ 632,500,000 |  |
Notes due 2025 | Convertible Notes |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  | $ 320,000,000
Interest rate | 1.00% |  |  |  |  | 0.25%
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Additional paid in capital |  | $ 207,900,000 |  |  |  |
Convertible debt |  | 244,500,000 |  |  |  |
Deferred income tax liabilities |  | 62,300,000 |  |  |  |
Accumulated deficit |  | 25,700,000 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Notes due 2028 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Additional paid in capital |  | 117,300,000 |  |  |  |
Convertible debt |  | 141,300,000 |  |  |  |
Deferred income tax liabilities |  | 36,000,000 |  |  |  |
Accumulated deficit |  | $ 12,000,000 |  |  |  |

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