Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Current Assets
Cash and cash equivalents	$ 37,355	$ 43,726
Accounts receivable	475	883
Grant receivable	453	145
Inventory, net	1,036	842
Prepaid expenses and other current assets	798	1,164
Total current assets	40,117	46,760
Fixed assets, net	2,236	2,788
Restricted cash	127	127
Other assets, net	145	152
Total assets	42,625	49,827
Current Liabilities
Accounts payable	449	464
Accrued expenses	2,026	3,341
Deferred revenue	619	668
Deferred rent	197	185
Total current liabilities	3,291	4,658
Deferred revenue, net of current portion	0	19
Deferred rent, net of current portion	464	564
Total liabilities	3,755	5,241
Commitments and Contingencies	0	0
Stockholders’ Equity
Common stock, $0.001 par value; 200,000,000 shares authorized, 115,200,421 and 111,032,957 shares issued and outstanding at September 30, 2018 and March 31, 2018, respectively	115	111
Additional paid-in capital	286,128	278,595
Accumulated deficit	(247,373)	(234,120)
Total stockholders’ equity	38,870	44,586
Total Liabilities and Stockholders’ Equity	$ 42,625	$ 49,827