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INCOME TAXES - Differences Between Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
U.S. federal income tax provision (benefit) at statutory rate | $ (61,805) | $ (2,842) | $ 216
Foreign income and losses taxed at different rates | 8,608 | 5,529 | 2,113
State income taxes, net of federal benefits, and state tax credits | 6,487 | 5,297 | 720
Change in valuation allowances | (4,474) | (10,074) | (7,727)
Effect of income tax rate changes on deferred items | 618 | (3,443) | 1,544
Tax effects of intercompany transactions | 0 | 0 | 607
Adjustments related to uncertain tax positions | (15,518) | (12,418) | 18
Non-deductible stock-based compensation expense | 3,803 | 6,355 | 3,239
Tax (windfalls)/shortfalls on stock-based compensation awards | 3,876 | 2,042 | (335)
Federal research and development credits, net of adjustments | 6,043 | 3,447 | (8,331)
Forgiveness of intercompany liabilities | (2,863) | 67 | (1,340)
Ordinary stock loss | 0 | 0 | (11,815)
Net operating loss expiration | 19,962 | 12,537 | 0
Goodwill impairment | 23,202 | 0 | 0
Non-deductible or non-taxable items | 4,557 | (5,736) | 20,134
Provision (benefit) for income taxes | $ (7,504) | $ 761 | $ (957)

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