Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenues	$ 75,195	$ 96,023	$ 70,530
Cost of revenues	64,352	74,041	67,442
Gross profit	10,843	21,982	3,088
Operating expenses:
Research and development	12,540	12,303	11,878
Selling, general and administrative	25,688	28,861	29,217
Arbitration award expense	0	0	8,987
Restructuring and impairments	0	779	5,366
Amortization of acquisition related intangibles	157	157	157
Total operating expenses	38,385	42,100	55,605
Operating loss	(27,542)	(20,118)	(52,517)
Change in fair value of derivatives and warrants	1,304	(228)	3,963
Gain on sale of minority interests	325	3,092	0
Interest expense, net	(383)	(1,037)	(1,882)
Other income (expense), net	65	(2,457)	1,596
Loss before income tax expense (benefit)	(26,231)	(20,748)	(48,840)
Income tax expense (benefit)	1,142	2,391	(184)
Net loss	$ (27,373)	$ (23,139)	$ (48,656)
Net loss per common share
Basic (in dollars per share)	$ (1.98)	$ (1.76)	$ (5.74)
Diluted (in dollars per share)	$ (1.98)	$ (1.76)	$ (5.74)
Weighted average number of common shares outstanding
Basic (in shares)	13,804	13,178	8,477
Diluted (in shares)	13,804	13,178	8,477