Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net loss (including noncontrolling interests)	$ (5,283)	$ (7,268)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	122	157
Depreciation and amortization	120	632
Amortization of operating lease right-of-use assets	399	505
Recoveries of bad debt	(46)
Changes in operating assets and liabilities:
Accounts receivable and unbilled revenue, net	(136)	434
Projects in process
Inventory	(1,133)	(1,440)
Prepaid expenses and other current assets	37	247
Accounts payable and accrued expenses	(460)	(406)
Deferred revenues	(65)	(28)
Operating lease obligations	(363)	(511)
Net cash used in operating activities	(6,808)	(7,678)
Cash flows from investing activities:
Purchase of property and equipment	(52)	(67)
Net cash used in investing activities	(52)	(67)
Cash flow from financing activities:
Proceeds from issuance of common stock, net of offering costs	4,686	15,062
Repurchase of common stock	(12)
Principal payments on finance lease obligations	(165)	(487)
Net cash provided by financing activities	4,509	14,575
Effect of exchange rate changes on cash	(216)	80
Net change in cash	(2,567)	6,910
Cash at beginning of year	17,383	10,473
Cash at end of year	14,816	17,383
Supplemental disclosure of cash flow information:
Cash paid for interest	9	15
Cash paid for income taxes	132	146
Supplemental disclosure of non-cash investing and financial activities:
Right-of-use asset obtained in exchange for finance lease obligations	24	$ 239
Acquisition of Pronode shares	$ 4,441