Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Numerator:
Income from continuing operations									$ (5,120)	$ 1,926	$ 1,598
Income from discontinued operations, net of income tax provision									0	916	489
Net income available to common stockholders	$ (1,076)	$ (1,680)	$ (1,892)	$ (472)	$ 183	$ 444	$ 1,291	$ 8	$ (5,120)	$ 1,926	$ 2,514
Denominator:
Common shares	88,888	88,289	88,557	88,233	88,950	89,594	89,073	88,592	88,477	89,071	78,310
Denominator for basic calculation	88,888	88,289	88,557	88,233	88,950	89,594	89,073	88,592	88,477	89,071	78,310
Employee stock options									0	2,088	2,927
Employee stock purchase rights									0	493	421
Denominator for diluted calculation	88,888	88,289	88,557	88,233	91,266	91,974	91,615	91,445	88,477	91,652	81,658
Income per share - continuing operations:
Basic									$ (0.06)	$ 0.02	$ 0.02
Diluted									(0.06)	0.02	0.02
Income per share - discontinued operations:
Basic									0.00	0.00	0.01
Diluted									0.00	0.00	0.01
Net income per share:
Basic	$ (0.01)	$ (0.02)	$ (0.02)	$ (0.01)	$ 0.00	$ 0.01	$ 0.01	$ 0.00	(0.06)	0.02	0.03
Diluted	$ (0.01)	$ (0.02)	$ (0.02)	$ (0.01)	$ 0.00	$ 0.01	$ 0.01	$ 0.00	$ (0.06)	$ 0.02	$ 0.03