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INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Accrued expenses and other liabilities | $ 54,699 | $ 35,565
Operating lease obligation | 16,279 | 22,557
Stock-based compensation | 5,129 | 7,657
Net operating loss and tax credit carryforwards | 142,835 | 157,202
Intangible assets, net | 22,974 | 21,002
Investments | 24,885 | 23,012
Unrealized foreign currency exchange losses | 1,244 | 3,765
Other | 985 | 1,017
Total deferred tax assets | 269,030 | 271,777
Less: Valuation allowance | (212,143) | (206,394)
Deferred tax assets, net of valuation allowance | 56,887 | 65,383
Prepaid expenses and other assets | (12,288) | (16,343)
Property, equipment and software, net | (8,211) | (11,994)
Right-of-use asset | (11,433) | (20,172)
Convertible senior notes | (1,163) | (1,883)
Deferred revenue | (15,369) | (14,064)
Total deferred tax liabilities | (48,464) | (64,456)
Net deferred tax asset (liability) | $ 8,423 | $ 927

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