Organization and Summary of Significant Accounting Policies - Weighted Average Number of Shares Outstanding and Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator for basic and diluted earnings per share:
Net income (loss)	$ (1,724)	$ 882	$ 29,205
Denominator:
Weighted average shares outstanding basic (in share)s	61,782	59,190	56,392
Dilutive effect of stock-based awards (in shares)		828	1,530
Diluted weighted average shares outstanding (in shares)	61,782	60,018	57,922
Anti-dilutive stock-based awards excluded (in shares)	12,150	12,627	6,757
Net income (loss) per share:
Basic (in dollars per share)	$ (0.03)	$ 0.01	$ 0.52
Diluted (in dollars per share)	$ (0.03)	$ 0.01	$ 0.50