Organization and Summary of Significant Accounting Policies - Weighted Average Number of Shares Outstanding and Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator for basic and diluted earnings per share:
Net income	$ 3,843	$ 1,521	$ 10,956	$ 14,829
Denominator:
Weighted average shares outstanding—basic	52,206	53,709	52,791	53,509
Dilutive effect of stock-based awards (in shares)	935	982	865	1,162
Diluted weighted average shares outstanding	53,141	54,691	53,656	54,671
Anti-dilutive stock-based awards excluded	227	160	304	160
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.07	$ 0.03	$ 0.21	$ 0.28
Diluted (in dollars per share)	$ 0.07	$ 0.03	$ 0.20	$ 0.27