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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Allowance for doubtful accounts $ 88 $ 109
Accrued vacation and bonuses 315 228
Stock-based compensation expense 396 194
Acquisition-related transaction costs 414 507
Total deferred tax assets 1,213 1,038
Deferred tax liabilities:    
Prepaid expenses 221 186
Depreciation, intangibles and other 2,017 555
Total deferred tax liabilities 2,238 741
Net deferred tax asset   $ 297
Net deferred tax liability $ (1,025)