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Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Current assets:    
Cash and cash equivalents $ 2,064 $ 3,955
Short-term investments 2,500 7,500
Accounts receivable and contract assets, net 3,262 3,025
Inventories, net 6,489 5,794
Prepaid expense and other current assets 693 953
Total current assets 15,008 21,227
Property and equipment, net 292 509
Operating lease right-of-use asset, net 2,113 2,256
Intangible assets, net 2,526 2,648
Goodwill 1,610 1,610
Other assets 214 251
Total assets 21,763 28,501
Current liabilities:    
Accounts payable 1,138 1,110
Accrued liabilities 1,154 692
Customer deposits 0 1,002
Deferred revenue - short term 452 407
Operating lease liability - short term 621 616
Warrants 12,786 19,703
Total current liabilities 16,151 23,530
Long-term liabilities:    
Deferred revenue - long term 133 137
Operating lease liability - long term 1,638 1,671
Total long-term liabilities 1,771 1,808
Total liabilities 17,922 25,338
Commitments and Contingencies  
Stockholders' equity:    
Common stock - 150,000,000 authorized; par value $0.0001 per share; 45,793,112 and 43,855,503 shares issued and outstanding at June 30, 2024 and December 31, 2023, respectively 4 4
Additional paid-in capital 102,793 101,147
Accumulated deficit (98,956) (97,988)
Total stockholders' equity 3,841 3,163
Total liabilities and stockholders' equity 21,763 28,501
Undesignated [Member]    
Stockholders' equity:    
Preferred stock 0 0
Convertible Preferred Stock [Member]    
Stockholders' equity:    
Preferred stock $ 0 $ 0