Summary of Significant Accounting Policies (EPS) (Details) - USD ($) $ / shares in Units, $ 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:
Net loss	$ (10,870)	$ (2,004)	$ (3,600)	$ (3,652)	$ (4,693)	$ (4,663)	$ (18,346)	$ (4,359)	$ (20,126)	$ (32,061)	$ (6,199)
Denominator:
Weighted-average common shares outstanding (shares)	27,759,000	27,672,000	27,598,000	27,482,000	24,071,000	21,883,000	21,820,000	21,669,000	27,627,693	22,353,419	20,987,964
Weighted-average effect of assumed conversion of stock options and restricted stock (shares)									0	0	0
Weighted-average common shares and share equivalents outstanding (shares)	27,759,000	27,672,000	27,598,000	27,482,000	24,071,000	21,883,000	21,820,000	21,669,000	27,627,693	22,353,419	20,987,964
Net income (loss) per common share:
Basic (usd per share)	$ (0.39)	$ (0.07)	$ (0.13)	$ (0.13)	$ (0.19)	$ (0.21)	$ (0.84)	$ (0.20)	$ (0.73)	$ (1.43)	$ (0.30)
Diluted (usd per share)	$ (0.39)	$ (0.07)	$ (0.13)	$ (0.13)	$ (0.19)	$ (0.21)	$ (0.84)	$ (0.20)	$ (0.73)	$ (1.43)	$ (0.30)