Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 54,098	$ 61,139
Prepaid expenses and other current assets	849	1,008
Total current assets	54,947	62,147
Property and equipment, net	1,865	1,961
Intangible assets, net	2,384	2,551
Goodwill	2,791	2,791
Right-of-use assets	7,869	8,062
Other assets	365	365
Total assets	70,221	77,877
Current liabilities:
Accounts payable	2,160	1,573
Accrued expenses	3,091	2,595
Deferred revenue	4	0
Lease liability, current	935	896
Related party note payable, current	801	917
Total current liabilities	6,991	5,981
Lease liability, less current portion	8,898	9,144
Related party note payable, less current	65,000	65,000
Total liabilities	80,889	80,125
Commitments and contingencies (Note 13)
Stockholders’ equity:
Preferred stock, $0.001 par value; authorized – 50,000 shares; no shares issued and outstanding	0	0
Common stock, $0.001 par value; authorized – 500,000 shares; issued and outstanding – 37,593 shares and 37,235 shares at March 31, 2023 and December 31, 2022, respectively	37	37
Additional paid-in capital	293,801	292,420
Accumulated other comprehensive income (loss)	0	0
Accumulated deficit	(304,506)	(294,705)
Total stockholders’ deficit	(10,668)	(2,248)
Total liabilities and stockholders’ equity	$ 70,221	$ 77,877