Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Product revenue	$ 64,897	$ 65,881	$ 71,954
Service revenue	2,745	6,329	16,669
Total revenue	67,642	72,210	88,623
Cost of product revenue	49,630	68,388	54,423
Cost of service revenue	2,015	4,959	11,220
Total cost of revenue	51,645	73,347	65,643
Gross profit (loss)	15,997	(1,137)	22,980
Operating expenses:
General and administrative	16,884	14,908	14,951
Goodwill and long lived asset impairment	6,023	0	0
Acquisition and integration related expenses	0	47	819
Sales and marketing	11,343	13,290	13,527
Research and development	1,668	2,554	2,026
Total operating expenses	35,918	30,799	31,323
Loss from operations	(19,921)	(31,936)	(8,343)
Other income (expense):
Interest expense	(297)	(376)	(481)
Interest income	128	300	567
Total other income (expense)	(169)	(76)	86
Loss before income tax	(20,090)	(32,012)	(8,257)
Income tax expense (benefit)	36	49	(2,058)
Net loss and comprehensive loss	$ (20,126)	$ (32,061)	$ (6,199)
Basic net loss per share attributable to common shareholders (usd per share)	$ (0.73)	$ (1.43)	$ (0.30)
Weighted-average common shares outstanding (shares)	27,627,693	22,353,419	20,987,964
Diluted net loss per share (usd per share)	$ (0.73)	$ (1.43)	$ (0.30)
Weighted-average common shares and share equivalents outstanding (shares)	27,627,693	22,353,419	20,987,964