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INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating loss (“NOL”) carryforwards $ 182,449 $ 158,727
Stock-based compensation 18,955 33,613
Long-term lease liabilities 29,314 32,642
Other 32,885 26,226
Total deferred tax assets 263,603 251,208
Less valuation allowance (77,076) (71,472)
Net deferred tax assets 186,527 179,736
Deferred tax liabilities:    
Intangible assets (47,858) (63,900)
Right-of-use assets (21,496) (24,836)
Capitalized software, leasehold improvements and equipment (16,152) (12,377)
Capitalized costs to obtain a contract with a customer (12,233) (9,400)
Other (4,338) (83)
Total deferred tax liabilities (102,077) (110,596)
Net deferred tax assets $ 84,450 $ 69,140