Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 11,688	$ 5,330
Short-term investments	6,500	13,949
Accounts receivable and contract assets, net	1,949	2,830
Inventories, net	6,520	3,975
Prepaid expenses and other current assets	722	775
Total current assets	27,379	26,859
Property and equipment, net	588	758
Operating lease right-of-use asset, net	232	285
Intangible assets, net	2,588	2,569
Other assets	69	100
Total assets	30,856	30,571
Current liabilities:
Accounts payable	1,928	1,419
Accrued liabilities	8,562	1,463
Customer deposits	3	0
Deferred revenue- short term	211	166
Operating lease liability - short term	113	108
Total current liabilities	10,817	3,156
Long-term liabilities:
Deferred revenue- long term	129	167
Operating lease liability - long term	135	193
Total long-term liabilities	264	360
Total liabilities	11,081	3,516
Stockholders' equity:
Preferred stock - 5,000,000 authorized; par value $0.0001 per share; none issued and outstanding	0	0
Common stock - 150,000,000 authorized; par value $0.0001 per share; 41,986,952 and 41,175,993 shares issued and outstanding at June 30, 2023 and December 31, 2022, respectively	4	4
Additional paid-in capital	96,182	94,333
Accumulated deficit	(76,411)	(67,376)
Accumulated other comprehensive loss	0	94
Total stockholders' equity	19,775	27,055
Total liabilities and stockholders' equity	$ 30,856	$ 30,571