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
	Mar. 31, 2019	Mar. 31, 2018
Numerator for basic and diluted earnings per share:
Net income	$ 6,419	$ 12,926
Denominator:
Weighted average shares outstanding—basic (in shares)	58,914	53,119
Dilutive effect of stock-based awards (in shares)	837	1,413
Diluted weighted average shares outstanding (in shares)	59,751	54,532
Anti-dilutive stock-based awards excluded (in shares)	12,125	404
Net income per common share:
Basic (in dollars per share)	$ 0.11	$ 0.24
Diluted (in dollars per share)	$ 0.11	$ 0.24