Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Net Income Per Share Details
Income from continuing operations	$ 183	$ 444	$ 1,291	$ 8	$ (1,971)	$ 89	$ 1,488	$ 1,992	$ 1,926	$ 1,598	$ 13,450
Income from discontinued operations, net of income tax provision									0	916	489
Net income available to common stockholders	$ 183	$ 444	$ 1,291	$ 8	$ (1,945)	$ 89	$ 2,231	$ 2,139	$ 1,926	$ 2,514	$ 13,939
Common shares	88,950	89,594	89,073	88,592	88,184	79,742	72,970	72,510	89,071	78,310	71,390
Denominator for basic calculation	88,950	89,594	89,073	88,592	88,184	79,742	72,970	72,510	89,071	78,310	71,390
Employee stock options									2,088	2,927	2,958
Employee stock purchase rights									493	421	352
Denominator for diluted calculation	91,266	91,974	91,615	91,445	88,184	83,182	76,232	75,756	91,652	81,658	74,700
Income per share - continuing operations:
Basic	$ 0.00	$ 0.01	$ 0.01	$ 0.00	$ (0.02)	$ 0.00	$ 0.02	$ 0.03	$ 0.02	$ 0.02	$ 0.19
Diluted	$ 0.00	$ 0.01	$ 0.01	$ 0.00	$ (0.02)	$ 0.00	$ 0.02	$ 0.03	$ 0.02	$ 0.02	$ 0.18
Income per share - discontinued operations:
Basic	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.01	$ 0.00	$ 0.00	$ 0.01	$ 0.01
Diluted	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.01	$ 0.00	$ 0.00	$ 0.01	$ 0.01
Net income per share:
Basic	$ 0.00	$ 0.01	$ 0.01	$ 0.00	$ (0.02)	$ 0.00	$ 0.03	$ 0.03	$ 0.02	$ 0.03	$ 0.20
Diluted	$ 0.00	$ 0.01	$ 0.01	$ 0.00	$ (0.02)	$ 0.00	$ 0.03	$ 0.03	$ 0.02	$ 0.03	$ 0.19