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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities:    
Net loss $ (4,866) $ (4,198)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 3 48
Loss on disposal of assets 18
Depreciation and amortization 49 55
Amortization of operating lease right-of-use assets 52 49
Inventory impairment loss 287
Changes in operating assets and liabilities:    
Accounts receivable and unbilled revenues, net (105) 512
Inventory 132 (689)
Prepaid expenses and other current assets 153 (76)
Accounts payable, accrued payroll and employee benefits, and accrued expenses (115) 256
Contract liabilities 15 (8)
Operating lease obligations (52) (49)
Net cash used in operating activities (4,429) (4,100)
Cash flows from investing activities:    
Purchase of property and equipment (37) (58)
Proceeds from sale of property and equipment 190
Net cash (used in) provided by investing activities 153 (58)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs 5,796 7,866
Principal payments on finance lease obligations (15) (77)
Net cash provided by financing activities 5,781 7,789
Effect of exchange rate changes on cash and cash equivalents (61) 24
Net change in cash and cash equivalents 1,444 3,655
Cash and cash equivalents at beginning of period 16,155 14,816
Cash and cash equivalents at end of period 17,599 18,471
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 10 95
Cash paid for interest $ 1 $ 8