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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net loss $ (2,233) $ (1,153)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 534 397
Depreciation and amortization 307 392
Loss on disposition of Tantaline 162
Impairment charge 111
Changes in assets and liabilities, net of effects of disposition of Tantaline:    
Accounts receivable (3,045) 1,592
Contract assets 50 (781)
Inventories (204) (1,616)
Other current assets 260 231
Accounts payable 398 (57)
Accrued expenses (29) (770)
Contract liabilities 190 659
Net cash used in operating activities (3,772) (833)
Cash flows from investing activities:    
Purchases of property and equipment (182) (225)
Net cash used in connection with disposition of Tantaline (312)
Net cash used in investing activities (182) (537)
Cash flows from financing activities    
Payments of long-term debt (40) (38)
Proceeds from exercise of stock options 76
Net cash (used in) provided by financing activities (40) 38
Net decrease in cash and cash equivalents (3,994) (1,332)
Cash and cash equivalents at beginning of period 14,025 14,365
Cash and cash equivalents at end of period 10,031 13,033
Supplemental disclosure of cash flow information:    
Income taxes paid 3 11
Interest paid $ 10 $ 12