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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator for basic and diluted earnings per share:
Net income	$ 8,485	$ 2,276	$ 21,411	$ 6,856
Denominator:
Weighted average shares outstanding—basic (in shares)	55,527	52,736	54,330	52,578
Dilutive effect of stock-based awards (in shares)	1,527	1,034	1,562	1,145
Diluted weighted average shares outstanding (in shares)	57,054	53,770	55,892	53,723
Anti-dilutive stock-based awards excluded (in shares)	3,023	544	1,533	690
Net income per common share:
Basic (in dollars per share)	$ 0.15	$ 0.04	$ 0.39	$ 0.13
Diluted (in dollars per share)	$ 0.15	$ 0.04	$ 0.38	$ 0.13