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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator for basic and diluted earnings per share:
Net income	$ 1,521	$ 7,558	$ 14,829	$ 14,832
Denominator:
Weighted average shares outstanding—basic	53,709	52,475	53,509	53,013
Dilutive effect of stock-based awards (in shares)	982	1,346	1,162	1,537
Diluted weighted average shares outstanding	54,691	53,821	54,671	54,550
Anti-dilutive stock-based awards excluded	160	336	160	328
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.03	$ 0.14	$ 0.28	$ 0.28
Diluted (in dollars per share)	$ 0.03	$ 0.14	$ 0.27	$ 0.27