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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Deferred tax assets: |  |
Allowance for doubtful accounts | $ 101 | $ 88
Accrued vacation and bonuses | 457 | 315
Stock-based compensation expense | 738 | 396
COVID-19 payroll tax deferment | 1,207 |
Acquisition-related transaction costs | 515 | 414
Net operating losses | 179 | 7
Total deferred tax assets | 3,197 | 1,220
Deferred tax liabilities: |  |
Prepaid expenses | 217 | 221
Depreciation, intangibles and other | 2,005 | 2,017
Total deferred tax liabilities | 2,222 | 2,238
Valuation allowance | (179) | (7)
Net deferred tax asset | $ 796 |
Net deferred tax liability |  | $ (1,025)

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