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RECENT ACCOUNTING PRONOUNCEMENTS - Cumulative Effect of ASU Adoption (Details) - USD ($) $ in Thousands | Apr. 01, 2022 | Dec. 31, 2021
--- | --- | ---
Liabilities |  |
Convertible debt, current | $ 37,518 | $ 36,824
Convertible debt, non-current | 113,324 | 98,941
Mezzanine equity |  |
Convertible debt |  | 883
Equity |  |
Additional paid-in capital | 2,362,873 | 2,387,039
Accumulated deficit | $ (2,073,288) | (2,087,957)
Cumulative Effect, Period of Adoption, Adjustment | ASU 2020-06 |  |
Liabilities |  |
Convertible debt, current |  | 626
Convertible debt, non-current |  | 14,167
Mezzanine equity |  |
Convertible debt |  | (883)
Equity |  |
Additional paid-in capital |  | (32,249)
Accumulated deficit |  | 18,339
Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Liabilities |  |
Convertible debt, current |  | 37,450
Convertible debt, non-current |  | 113,108
Mezzanine equity |  |
Convertible debt |  | 0
Equity |  |
Additional paid-in capital |  | 2,354,790
Accumulated deficit |  | $ (2,069,618)

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