Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Selected Quarterly Financial Information [Abstract]
Total revenue	$ 15,290	$ 20,617	$ 18,670	$ 15,634	$ 18,576	$ 16,751	$ 15,728	$ 16,587	$ 70,211	$ 67,642	$ 72,210
Gross profit	912	6,155	6,244	4,026	4,619	4,708	2,913	3,757	17,337	15,997	(1,137)
Net loss	$ (7,292)	$ (1,086)	$ (970)	$ (2,940)	$ (10,871)	$ (2,004)	$ (3,600)	$ (3,651)	$ (12,288)	$ (20,126)	$ (32,061)
Basic net income per share (in usd per share)	$ (0.26)	$ (0.04)	$ (0.03)	$ (0.11)	$ (0.39)	$ (0.07)	$ (0.13)	$ (0.13)	$ (0.44)	$ (0.73)	$ (1.43)
Shares used in basic per share calculation	28,310,000	28,259,000	28,172,000	27,886,000	27,759,000	27,672,000	27,598,000	27,482,000	28,156,382	27,627,693	22,353,419
Diluted net income per share (in usd per share)	$ (0.26)	$ (0.04)	$ (0.03)	$ (0.11)	$ (0.39)	$ (0.07)	$ (0.13)	$ (0.13)	$ (0.44)	$ (0.73)	$ (1.43)
Shares used in diluted per share calculation	28,310,000	28,259,000	28,172,000	27,886,000	27,759,000	27,672,000	27,598,000	27,482,000	28,156,382	27,627,693	22,353,419
Impairment write-off of intangible assets									$ 250
Inventory reserve and other adjustments									2,209
Goodwill impairment charge										$ 4,409
Impairment related to write-down to fair value of manufacturing facility									$ 1,614
Reserve for loss contingency										$ 1,400