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, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator for basic and diluted earnings per share:
Net income	$ 738	$ 6,419	$ 8,485	$ 12,926	$ 7,157	$ 21,411
Denominator:
Weighted average shares outstanding—basic (in shares)	59,187		55,527		59,051	54,330
Dilutive effect of stock-based awards (in shares)	813		1,527		825	1,562
Diluted weighted average shares outstanding (in shares)	60,000		57,054		59,876	55,892
Anti-dilutive stock-based awards excluded (in shares)	12,056		3,023		12,111	1,533
Net income per common share:
Basic (in dollars per share)	$ 0.01		$ 0.15		$ 0.12	$ 0.39
Diluted (in dollars per share)	$ 0.01		$ 0.15		$ 0.12	$ 0.38