Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 4,857	$ 7,363
Accounts receivable, net of allowance for doubtful accounts of $11 as of both March 31, 2023 and December 31, 2022	153	201
Prepaid expenses and other current assets	279	300
Total current assets	5,289	7,864
Property and equipment, net	158	170
Operating lease right-of-use asset, net	1,509	1,588
Other assets	172	171
Total assets	7,128	9,793
Current liabilities:
Accounts payable	861	683
Accrued expenses and other current liabilities	2,472	2,246
Deferred revenue	340	341
Operating lease liability - current	327	315
Total current liabilities	4,000	3,585
Operating lease liability - noncurrent	1,228	1,316
Total liabilities	5,228	4,901
Commitments and Contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value, 25,000,000 shares authorized and no shares issued and outstanding as of March 31, 2023 and December 31, 2022	0	0
Common stock, $0.001 par value, 100,000,000 shares authorized, 20,202,005 and 20,076,773 shares issued and outstanding as of March 31, 2023 and December 31, 2022, respectively	20	20
Additional paid-in capital	145,985	145,476
Accumulated deficit	(144,105)	(140,604)
Total stockholders’ equity	1,900	4,892
Total liabilities and stockholders’ equity	$ 7,128	$ 9,793