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Net Income Per Share - Components of Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator
Net income	$ 7,141	$ 8,061	$ 5,416	$ 3,254	$ (6,778)	$ 2,176	$ 1,968	$ 2,985	$ 23,872	$ 351	$ 4,963
Denominator
Weighted average common shares outstanding, basic									17,196	17,183	16,947
Options to purchase common stock									306	150	267
Restricted stock units									104	23	27
Weighted average common shares outstanding, diluted									17,606	17,356	17,241
Net income per share
Basic									$ 1.39	$ 0.02	$ 0.29
Diluted	$ 0.40	$ 0.45	$ 0.31	$ 0.19	$ (0.39)	$ 0.13	$ 0.11	$ 0.17	$ 1.36	$ 0.02	$ 0.29

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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