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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