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, 2020	Mar. 31, 2019
Numerator for basic and diluted earnings per share:
Net income	$ 4,074	$ 6,419
Denominator:
Weighted average shares outstanding (in shares)	59,609	58,914
Dilutive effect of stock-based awards (in shares)	785	837
Diluted weighted average shares outstanding (in shares)	60,394	59,751
Anti-dilutive stock-based awards excluded (in shares)	12,161	12,125
Net income per common share:
Basic (in dollars per share)	$ 0.07	$ 0.11
Diluted (in dollars per share)	$ 0.07	$ 0.11