Organization and Summary of Significant Accounting Policies - Weighted Average Number of Shares Outstanding and Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator for basic and diluted earnings per share:
Net income (loss)	$ (30,759)	$ 4,074	$ 738	$ 6,419	$ (26,685)	$ 7,157
Denominator:
Weighted average shares outstanding (in shares)	60,346		59,187		59,977	59,051
Dilutive effect of stock-based awards (in shares)			813			825
Diluted weighted average shares outstanding (in shares)	60,346		60,000		59,977	59,876
Anti-dilutive stock-based awards excluded (in shares)	12,773		12,056		12,866	12,111
Net income (loss) per common share:
Basic (in dollars per share)	$ (0.51)		$ 0.01		$ (0.44)	$ 0.12
Diluted (in dollars per share)	$ (0.51)		$ 0.01		$ (0.44)	$ 0.12