Organization and Summary of Significant Accounting Policies - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Basic:
Net income (loss)	$ (6,601)	$ 906
Basic weighted shares outstanding (in shares)	72,588	71,262
Net loss per share (in dollars per share)	$ (0.09)	$ 0.01
Diluted:
Net income (loss)	$ (6,601)	$ 906
Basic weighted shares outstanding (in shares)	72,588	71,262
Effect of dilutive securities:
Stock options, ESPP, restricted stock units, restricted stock awards and convertible senior notes (in shares)	0	1,927
Diluted weighted shares outstanding (in shares)	72,588	73,189
Net loss per share (in dollars per share)	$ (0.09)	$ 0.01