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INCOME TAXES - Deferred Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets |  |
Net operating loss carryforwards | $ 121,839 | $ 172,359
Research and development tax credit carryforwards | 55,211 | 55,966
Other | 1,100 | 1,412
Total deferred tax assets before valuation allowance | 178,150 | 229,737
Valuation allowance | (63,423) | (63,620)
Total deferred tax assets | 114,727 | 166,117
Deferred tax liabilities |  |
Debt issuance discount and other | (10,596) | (11,946)
Unrealized Gain on Investment | (10,372) | 0
Net deferred tax assets | $ 93,759 | $ 154,171

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