Unaudited Condensed Consolidated Statements of Operations and Other Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Revenues
Total Revenues	$ 779	$ 1,153	$ 2,411	$ 3,498
Cost of revenues	136	192	381	747
Research and development expenses	3,782	4,005	10,348	13,982
Selling, general and administrative expenses	3,387	4,865	11,794	16,457
Total costs and expenses	7,305	9,062	22,523	31,186
Loss from Operations	(6,526)	(7,909)	(20,112)	(27,688)
Other Income (Expense)
Gain (loss) on fixed asset disposals	(65)	0	(63)	0
Interest income	192	118	526	334
Total Other Income	127	118	463	334
Income Tax Expense	0	0	(3)	0
Net Loss	(6,399)	(7,791)	(19,652)	(27,354)
Currency Translation Adjustment	0	(2)	0	(2)
Comprehensive Loss	$ (6,399)	$ (7,793)	$ (19,652)	$ (27,356)
Net loss per common share—basic and diluted	$ (0.06)	$ (0.07)	$ (0.17)	$ (0.26)
Weighted average shares used in computing net loss per common share—basic and diluted	116,256,561	107,345,623	113,991,794	106,107,721
Products and Services [Member]
Revenues
Total Revenues	$ 670	$ 832	$ 1,709	$ 2,722
Collaborations and Licenses [Member]
Revenues
Total Revenues	43	61	128	367
Grants [Member]
Revenues
Total Revenues	$ 66	$ 260	$ 574	$ 409