Stock Option Plans and 401(k) Plan (Details 2) - $ / shares	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at beginning	5,300,338	1,659,324
Options granted	1,355,000	3,675,000
Options exercised	(29,250)	0
Options forfeited	0	(12,154)
Options expired	0	(21,832)
Options outstanding at end	6,626,088	5,300,338
Options exercisable at end	4,303,972	1,818,962
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Options outstanding at beginning	$ 2.43	$ 4.76
Options granted	1.45	1.44
Options exercised	1.50	0.00
Options forfeited	0.00	5.39
Options expired	0.00	9.42
Options outstanding at end	1.48	2.43
Options exercisable at end	1.53	3.31
Weighted average grant-date fair value of options granted	$ 1.15	$ 1.10