Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 6,394	$ 11,446
Assets held for sale	338	700
Prepaid expenses and other current assets	2,195	1,109
Total current assets	8,927	13,255
Property and equipment, net	1,627	1,775
Operating lease right-of-use assets	6,584	6,906
Other assets	911	911
TOTAL ASSETS	18,049	22,847
Current liabilities
Accounts payable and accrued expenses	1,714	1,380
Other current liabilities	458	687
Total current liabilities	2,172	2,067
Common stock warrant liability	961	1,489
Operating lease liabilities	2,495	2,632
Finance lease liabilities		41
Total liabilities	5,628	6,229
STOCKHOLDERS’ EQUITY
Preferred stock – 25,000,000 shares authorized, 0 shares issued and outstanding at March 31, 2023 and December 31, 2022
Common stock – $.001 par value; 250,000,000 shares authorized; 7,325,006 and 7,258,186 shares issued and outstanding at March 31, 2023 and December 31, 2022, respectively	7	7
Additional paid-in capital	532,888	532,842
Accumulated deficit	(520,474)	(516,231)
Total stockholders’ equity	12,421	16,618
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 18,049	$ 22,847