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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:    
Net loss (including noncontrolling interests) $ (3,942) $ (5,495)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 29 72
Depreciation and amortization 1,008 953
Loss on disposal of property and equipment 6
Changes in operating assets and liabilities:    
Accounts receivable 481 542
Projects in process 1 (1)
Inventory (142) (372)
Prepaid expenses and other current assets 556 293
Accounts payable and accrued expenses 41 (896)
Deferred revenues (897) (677)
Net cash used in operating activities (2,859) (5,581)
Cash flows from investing activities:    
Purchase of property and equipment (236) (656)
Proceeds from sale of property and equipment 4
Net cash used in investing activities (232) (656)
Cash flow from financing activities:    
Proceeds from issuance of common stock and warrants, net of offering costs 4,620 9,079
Proceeds from note payable 1,713
Payments on note payable (1,713)
Principal payments on capital lease obligations (551) (438)
Net cash provided by financing activities 4,069 8,641
Effect of exchange rate changes on cash (219) (84)
Net change in cash 759 2,320
Cash at beginning of year 5,796 3,476
Cash at end of year 6,555 5,796
Supplemental disclosure of cash flow information:    
Cash paid for interest 49 73
Cash paid for income taxes 13 219
Supplemental disclosure of non-cash investing and financing activities:    
Purchase of equipment with capital lease obligations $ 169 $ 1,287