Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net loss (including noncontrolling interests)	$ (5,802)	$ (3,942)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense		29
Bad debt expense	105
Write-off of prepaids	414
Depreciation and amortization	855	1,008
Amortization of operating lease right-of-use assets	404
Loss on disposal of property and equipment		6
Changes in operating assets and liabilities:
Accounts receivable	397	481
Projects in process	(8)	1
Inventory	124	(142)
Prepaid expenses and other current assets	(19)	556
Accounts payable and accrued expenses	454	41
Deferred revenues	(429)	(897)
Operating lease obligations	(12)
Net cash used in operating activities	(3,517)	(2,859)
Cash flows from investing activities:
Purchase of property and equipment	(89)	(236)
Proceeds from sale of property and equipment		4
Net cash used in investing activities	(89)	(232)
Cash flow from financing activities:
Proceeds from issuance of common stock and warrants, net of offering costs	36	4,620
Principal payments on finance lease obligations	(535)	(551)
Net cash (used in) provided by financing activities	(499)	4,069
Effect of exchange rate changes on cash	(93)	(219)
Net change in cash	(4,198)	759
Cash at beginning of year	6,555	5,796
Cash at end of year	2,357	6,555
Supplemental disclosure of cash flow information:
Cash paid for interest	34	49
Cash paid for income taxes	38	13
Supplemental disclosure of non-cash investing and financing activities:
Purchase of equipment with finance lease obligations		$ 169