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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