Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (1,472)	$ (40)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	267	135
Depreciation and amortization	153	166
Changes in assets and liabilities:
Accounts receivable	(1,065)	1,420
Contract assets	(1,085)	(1,537)
Inventories	(471)	(262)
Other current assets	(28)	119
Accounts payable	611	(25)
Accrued expenses	(75)	(467)
Contract liabilities	1,122	(2,781)
Net cash used in operating activities	(2,043)	(3,272)
Cash flows from investing activities:
Purchases of property and equipment	(70)	(146)
Net cash used in investing activities	(70)	(146)
Cash flows from financing activities:
Repayments of long-term debt	(19)	(19)
Proceeds from exercise of stock options		73
Net cash (used in) provided by financing activities	(19)	54
Net decrease in cash and cash equivalents	(2,132)	(3,364)
Cash and cash equivalents at beginning of period	14,025	14,365
Cash and cash equivalents at end of period	11,893	11,001
Supplemental disclosure of cash flow information:
Income taxes paid		8
Interest paid	$ 6	$ 6