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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net loss (including noncontrolling interests) $ (5,649) $ (7,835) $ (14,234)
Adjustments to reconcile net loss to net cash used in operating activities:      
Stock-based compensation expense 255 1,075 1,729
Bad debt expense 167
Depreciation and amortization 360 187 202
Loss on disposal of property and equipment 91 28 16
Changes in operating assets and liabilities:      
Accounts receivable (204) (239) (304)
Projects in process 158 38 530
Inventory (737)
Prepaid expenses and other current assets (1,316) (263) (60)
Accounts payable and accrued expenses 343 871 363
Deferred revenues 447 (1,925) (233)
Net cash used in operating activities (6,252) (8,063) (11,824)
Cash flows from investing activities:      
Purchase of property and equipment (987) (198) (115)
Investment in joint venture (3)
Proceeds from sale of property and equipment 5 7
Net cash used in investing activities (985) (198) (108)
Cash flow from financing activities:      
Proceeds from exercise of warrants 36
Proceeds from issuance of common stock and pre-funded warrants, net of offering costs 7,913 5,422 9,253
Contributions from noncontrolling interests 3
Principal payments on capital lease obligations (116) (57) (34)
Net cash provided by financing activities 7,797 5,368 9,255
Effect of exchange rate changes on cash (166) (154) (9)
Net change in cash 394 (3,047) (2,686)
Cash at beginning of year 3,082 6,129 8,815
Cash at end of year 3,476 3,082 6,129
Supplemental disclosure of cash flow information:      
Cash paid for interest 48 18 14
Cash paid for income taxes 367 93 5
Supplemental disclosure of non-cash investing and financing activities:      
Purchase of equipment with capital lease obligation $ 983 $ 530