Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator
Net income	$ 1,513	$ 2,296	$ 1,670	$ 481
Denominator for basic earnings (loss) per share:
Weighted average common shares outstanding	53,647	52,457	53,453	52,284
Dilutive potential common shares:
Stock options	916	1,141	953	1,274
Restricted stock awards	450	567	518	721
Performance-based restricted stock units	1,178	663	1,126	717
Employee stock purchase plan	0	0	0	2
Weighted average common shares outstanding with assumed conversion	56,191	54,828	56,050	54,998
Basic earnings per share	$ 0.03	$ 0.04	$ 0.03	$ 0.01
Diluted earnings per share	$ 0.03	$ 0.04	$ 0.03	$ 0.01