Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Current Assets
Cash and cash equivalents	$ 36,477	$ 43,726
Accounts receivable	503	883
Grant receivable	55	145
Inventory, net	490	842
Prepaid expenses and other current assets	1,049	1,164
Total current assets	38,574	46,760
Fixed assets, net	1,832	2,788
Restricted cash	79	127
Other assets, net	138	152
Total assets	40,623	49,827
Current Liabilities
Accounts payable	628	464
Accrued expenses	2,549	3,341
Deferred revenue	525	668
Deferred rent	35	185
Total current liabilities	3,737	4,658
Deferred revenue, net of current portion	0	19
Deferred rent, net of current portion	588	564
Total liabilities	4,325	5,241
Commitments and Contingencies	0	0
Stockholders' Equity
Common stock, $0.001 par value; 200,000,000 shares authorized, 124,015,429 and 111,032,957 shares issued and outstanding at March 31, 2019 and March 31, 2018, respectively	124	111
Additional paid-in capital	296,929	278,595
Accumulated deficit	(260,755)	(234,120)
Total stockholders' equity	36,298	44,586
Total Liabilities and Stockholders' Equity	$ 40,623	$ 49,827