Quarterly Financial Data (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
Selected Quarterly Financial Information [Abstract]
Total revenue	$ 18,576	$ 16,751	$ 15,728	$ 16,587	$ 19,366	$ 26,138	$ 13,393	$ 13,313	$ 67,642	$ 72,210	$ 88,623
Gross profit	4,618	4,708	2,913	3,758	2,982	3,824	(10,555)	2,612	15,997	(1,137)	22,980
Net income (loss)	$ (10,870)	$ (2,004)	$ (3,600)	$ (3,652)	$ (4,693)	$ (4,663)	$ (18,346)	$ (4,359)	$ (20,126)	$ (32,061)	$ (6,199)
Basic net income per share (in 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)
Shares used in basic per share calculation	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
Diluted net income per share (in 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)
Shares used in diluted per share calculation	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