Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenues	$ 12,607	$ 8,923
Cost of revenues	8,714	13,409
Gross margin	3,893	(4,486)
Operating expenses:
Research and development	2,840	2,717
Selling, general and administrative	5,786	6,138
Amortization of acquisition-related intangibles	85	13
Restructuring	310	1,339
Total operating expenses	9,021	10,207
Operating loss	(5,128)	(14,693)
Change in fair value of warrants	(464)	925
Interest income (expense), net	201	(10)
Other income (expense), net	609	(1,374)
Loss before income tax (benefit) expense	(4,782)	(15,152)
Income tax (benefit) expense	(45)	100
Net loss	$ (4,737)	$ (15,252)
Net loss per common share
Basic (in dollars per share)	$ (0.23)	$ (0.91)
Diluted (in dollars per share)	$ (0.23)	$ (0.91)
Weighted average number of common shares outstanding
Basic (in shares)	20,167	16,778
Diluted (in shares)	20,167	16,778