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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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) |

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