Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 3,828	$ 4,937
Short-term investments	19,865	29,983
Accounts receivable and contract assets	2,222	3,859
Inventories, net	2,962	1,566
Prepaid expenses and other current assets	600	868
Total current assets	29,477	41,213
Property and equipment, net	819	976
Operating lease right-of-use asset, net	311	51
Intangible assets, net	1,900	1,982
Other assets	11	9
Total assets	32,518	44,231
Current liabilities:
Accounts payable	945	1,779
Accrued liabilities	991	824
Customer deposits	0	43
Deferred revenue- short term	144	155
Operating lease liability - short term	106	56
Total current liabilities	2,186	2,857
Long-term liabilities:
Deferred revenue- long term	156	110
Operating lease liability - long term	221	0
Total long-term liabilities	377	110
Total liabilities	2,563	2,967
Commitments and contingencies
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; 41,125,578 and 40,851,945 shares issued and outstanding each period, respectively	4	4
Additional paid-in capital	93,736	91,025
Accumulated deficit	(63,841)	(49,759)
Accumulated other comprehensive loss	56	(6)
Total stockholders' equity	29,955	41,264
Total liabilities and stockholders' equity	$ 32,518	$ 44,231