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									12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator for basic and diluted earnings per share:
Net income	$ (12,379)	$ 6,104	$ 738	$ 6,419	$ 2,083	$ 5,711	$ 8,485	$ 12,926	$ 5,207	$ 882	$ 29,205	$ 5,207
Denominator:
Weighted average shares outstanding—basic (in shares)										59,190	56,392	52,726
Dilutive effect of stock-based awards (in shares)										828	1,530	1,172
Diluted weighted average shares outstanding (in shares)										60,018	57,922	53,898
Anti-dilutive stock-based awards excluded (in shares)										12,627	6,757	386
Net income per common share:
Basic (in dollars per share)	$ (0.21)	$ 0.10	$ 0.01	$ 0.11	$ 0.04	$ 0.10	$ 0.15	$ 0.24		$ 0.01	$ 0.52	$ 0.10
Diluted (in dollars per share)	$ (0.21)	$ 0.10	$ 0.01	$ 0.11	$ 0.03	$ 0.10	$ 0.15	$ 0.24		$ 0.01	$ 0.50	$ 0.10