Unaudited Condensed Consolidated Statements of Operations and Other Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Revenues
Total Revenues	$ 668	$ 689
Cost of revenues	51	120
Research and development expenses	3,823	3,379
Selling, general and administrative expenses	3,315	4,767
Total costs and expenses	7,189	8,266
Loss from Operations	(6,521)	(7,577)
Other Income (Expense)
Gain on fixed asset disposals	1	2
Interest income	197	162
Total Other Income	198	164
Income Tax Expense	0	(3)
Net Loss	(6,323)	(7,416)
Comprehensive Loss	$ (6,323)	$ (7,416)
Net loss per common share—basic and diluted	$ (0.05)	$ (0.07)
Weighted average shares used in computing net loss per common share—basic and diluted	126,854,907	111,458,445
Products and Services [Member]
Revenues
Total Revenues	$ 606	$ 546
Collaborations and Licenses [Member]
Revenues
Total Revenues	10	43
Grants [Member]
Revenues
Total Revenues	$ 52	$ 100