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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 carryforwards | $ 79,475 | $ 83,120
Accruals | 2,879 | 1,464
Stock-based compensation | 2,841 | 2,853
Bad debt | 262 | 168
Deferred rent | 5,043 | 5,412
Other | 1,185 | 1,532
Total deferred tax assets | 91,685 | 94,549
Valuation allowance | (83,978) | (87,698)
Net deferred tax asset | 7,707 | 6,851
Deferred tax liabilities |  |
Deferred state income tax | (2,087) | (2,158)
Depreciation and amortization | (1,720) | (835)
Intangible assets | (3,905) | (3,751)
Total deferred tax liability | (7,712) | (6,744)
Net deferred tax asset (liability) | $ 5 | $ 107

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