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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating activities    
Net income (loss) $ 122 $ (740)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 130 36
Amortization of right-of-use financing leases 73 51
Amortization of imputed interest (107)
Amortization of right-of-use operating leases 169 163
Change in receivable reserves 13 28
Stock-based compensation 143 57
Other (14)
Changes in current operating assets and liabilities:    
Accounts receivable 3,275 (1,743)
Inventories (841) (2,527)
Prepaid expenses and other assets (57) (478)
Income taxes 2 19
Accounts payable and accrued liabilities (750) 2,920
Deferred revenue (570) 4,569
Operating lease liabilities (170) (161)
Net cash provided by operating activities 1,525 2,087
Investing activities    
Purchases of property and equipment (194) (112)
Net cash used in investing activities (194) (112)
Financing activities    
Net proceeds from the exercise of options for common stock 17
Principal repayments of financing leases (71) (48)
Net cash used in financing activities (71) (31)
Increase in cash 1,260 1,944
Cash, beginning of period 10,296 11,699
Cash, end of period 11,556 13,643
Non-cash investing and financing activities:    
Acquisition of right-of-use assets and lease liabilities $ 156