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Income Taxes - Schedule of Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Accruals and reserves | $ 4,315 | $ 5,346
Share-based compensation expense | 5,469 | 4,958
Alternative minimum tax credit carryforward | 0 | 371
General business credit carryforward | 4,500 | 3,936
State tax credits | 5,500 | 5,500
Net operating loss carryforwards | 42,146 | 27,269
Operating lease obligation | 42,039 | 46,525
Amortization of intangible assets | 1,073 | 0
Other | 647 | 583
Deferred tax assets, gross | 105,689 | 94,488
Valuation allowances | (62,724) | (36,652)
Deferred tax assets, net of valuation allowance | 42,965 | 57,836
Deferred tax liabilities: |  |
Prepaid services | (715) | (288)
Amortization of intangible assets | 0 | (7,760)
Depreciation of fixed assets | (5,104) | (7,534)
Right-of-use assets | (38,666) | (43,342)
Deferred tax liabilities, gross | (44,485) | (58,924)
Net deferred tax liabilities | $ (1,520) | $ (1,088)

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