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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator for basic and diluted earnings per share:
Net income	$ 5,711	$ 422	$ 27,122	$ 7,278
Denominator:
Weighted average shares outstanding—basic (in shares)	58,340	52,831	55,681	52,663
Dilutive effect of stock-based awards (in shares)	1,465	1,012	1,573	1,099
Diluted weighted average shares outstanding (in shares)	59,805	53,843	57,254	53,762
Anti-dilutive stock-based awards excluded (in shares)	6,793	575	6,760	506
Net income per common share:
Basic (in dollars per share)	$ 0.10	$ 0.01	$ 0.49	$ 0.14
Diluted (in dollars per share)	$ 0.10	$ 0.01	$ 0.47	$ 0.14