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Income Taxes - Tax Effects of Temporary Differences that Give Rise to Significant Portion of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets (liabilities): |  |
Reserves and allowances | $ 1,804 | $ 1,774
Accrued expenses | 1,810 | 2,651
Net operating losses |  | 326
Research and development tax credit | 774 | 280
Stock-based compensation | 1,722 | 126
Other | 971 | 760
Prepaid expenses | (580) | (484)
Property and equipment | (2,026) | (2,254)
Capitalized software development costs | (1,116) | (1,075)
Valuation allowance |  | (326)
Total deferred tax assets, net | $ 3,359 | $ 1,778

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