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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator for basic and diluted earnings per share:
Net income	$ 3,650	$ 6,103	$ 7,113	$ 13,308
Denominator:
Weighted average shares outstanding—basic	52,480	53,644	53,087	53,407
Dilutive effect of stock-based awards (in shares)	809	1,156	803	1,255
Diluted weighted average shares outstanding	53,289	54,800	53,890	54,662
Anti-dilutive stock-based awards excluded	369	153	520	173
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.07	$ 0.11	$ 0.13	$ 0.25
Diluted (in dollars per share)	$ 0.07	$ 0.11	$ 0.13	$ 0.24