Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 38,496	$ 1,470
Marketable securities, short term	1,144	7,308
Funds receivable from sale of New Jersey net operating loss		776
Accounts receivable, net	26	44
Prepaid expenses and other current assets	91	848
Total current assets	39,757	10,446
Property and equipment, net	6,629	7,116
Right of use assets, net	188	152
Patent and trademark rights, net	1,407	1,151
Marketable securities, long term	14,836
Other assets	1,347	1,354
Total assets	64,164	20,219
Current liabilities:
Accounts payable	205	472
Accrued expenses	322	403
Current portion of operating lease liabilities	42	38
Current portion of financing obligation	226	214
Total current liabilities	795	1,127
Long-term liabilities:
Operating lease obligation	146	114
Notes payable, net		3,910
Financing obligation arising from sale leaseback transaction (Note 14)	1,934	2,104
Redeemable warrants	177	57
Commitments and contingencies
Stockholders' equity:
Series B Convertible Preferred Stock, stated value $1,000 per share, 8,000 shares designated, 733 and 778 shares issues and outstanding, respectively	733	778
Common stock, par value $0.001 per share, authorized 350,000,000 shares; issued and outstanding 40,685,282 and 10,386,754 respectively	41	10
Additional paid-in capital	398,925	340,228
Accumulated other comprehensive income	(12)
Accumulated deficit	(338,575)	(328,109)
Total stockholders' equity	61,112	12,907
Total liabilities and stockholders' equity	$ 64,164	$ 20,219