Unaudited Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Product revenue	$ 16,094	$ 23,646	$ 46,872	$ 48,534
Service revenue	657	2,492	2,195	4,309
Total revenue	16,751	26,138	49,067	52,843
Cost of product revenue	11,574	20,293	35,988	53,512
Cost of service revenue	468	2,021	1,700	3,451
Total cost of revenue	12,042	22,314	37,688	56,963
Gross (loss) profit	4,709	3,824	11,379	(4,120)
Operating expenses:
General and administrative	3,861	3,816	11,135	11,328
Sales and marketing	2,409	3,771	8,112	10,016
Research and development	381	889	1,244	1,874
Total operating expenses	6,651	8,476	20,491	23,218
Loss from operations	(1,942)	(4,652)	(9,112)	(27,338)
Other income (expense):
Interest expense	(71)	(62)	(223)	(235)
Interest income	27	69	107	246
Total other income (expense)	(44)	7	(116)	11
Loss before income tax	(1,986)	(4,645)	(9,228)	(27,327)
Income tax expense	18	18	28	41
Net loss	$ (2,004)	$ (4,663)	$ (9,256)	$ (27,368)
Basic net loss per share attributable to common shareholders (in dollars per share)	$ (0.07)	$ (0.21)	$ (0.34)	$ (1.26)
Weighted-average common shares outstanding (in shares)	27,671,633	21,882,741	27,584,288	21,791,184
Diluted net loss per share (in dollars per share)	$ (0.07)	$ (0.21)	$ (0.34)	$ (1.26)
Weighted-average common shares and share equivalents outstanding (in shares)	27,671,633	21,882,741	27,584,288	21,791,184