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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)