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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net loss (including noncontrolling interests) $ (3,026) $ (3,475)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 29 56
Depreciation and amortization 785 672
Changes in operating assets and liabilities:    
Accounts receivable 866 933
Projects in process 1 (299)
Inventory (198) (1,222)
Prepaid expenses and other current assets 116 (52)
Accounts payable and accrued expenses (91) (675)
Deferred revenues (757) (629)
Net cash used in operating activities (2,275) (4,691)
Cash flows from investing activities:    
Purchase of property and equipment (184) (643)
Net cash used in investing activities (184) (643)
Cash flows from financing activities:    
Proceeds from issuance of common stock and warrants, net of offering costs 9,082
Proceeds from note payable 1,713
Payments on note payable (1,713)
Principal payments on capital lease obligations (413) (301)
Net cash (used in) provided by financing activities (413) 8,781
Effect of exchange rate changes on cash (235) (51)
Net increase (decrease) in cash (3,107) 3,396
Cash at beginning of period 5,796 3,476
Cash at end of period 2,689 6,872
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 13 15
Cash paid for interest 39 59
Supplemental disclosure of non-cash investing and financing activities    
Purchase of equipment with capital lease obligations $ 169 $ 1,287