Unaudited Condensed Consolidated Statements of Operations and Other Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues
Total Revenues	$ 943	$ 1,355	$ 1,632	$ 2,345
Cost of revenues	125	254	245	555
Research and development expenses	3,187	4,944	6,566	9,977
Selling, general and administrative expenses	3,640	5,736	8,407	11,592
Total costs and expenses	6,952	10,934	15,218	22,124
Loss from Operations	(6,009)	(9,579)	(13,586)	(19,779)
Other Income (Expense)
Gain (loss) on fixed asset disposals	0	0	2	0
Interest income	172	118	334	216
Total Other Income	172	118	336	216
Income Tax Expense	0	0	(3)	0
Net Loss	(5,837)	(9,461)	(13,253)	(19,563)
Currency Translation Adjustment	0	0	0	(11)
Comprehensive Loss	$ (5,837)	$ (9,461)	$ (13,253)	$ (19,574)
Net loss per common share—basic and diluted	$ (0.05)	$ (0.09)	$ (0.12)	$ (0.19)
Weighted average shares used in computing net loss per common share—basic and diluted	113,993,237	106,297,699	112,732,767	105,497,939
Products and Services [Member]
Revenues
Total Revenues	$ 493	$ 946	$ 1,039	$ 1,890
Collaborations and Licenses [Member]
Revenues
Total Revenues	42	260	85	306
Grants [Member]
Revenues
Total Revenues	$ 408	$ 149	$ 508	$ 149