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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Operating activities:    
Net loss $ (1,192) $ (1,727)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation and amortization 735 742
Share-based compensation 182 188
Changes in assets and liabilities related to operations:    
Trade accounts receivable (119) (336)
Other receivables   1
Inventories 288 26
Prepaid expenses and other assets 120 (167)
Accounts payable (14) 5
Accrued expenses (240) 87
Net cash used in operating activities (240) (1,181)
Investing activities:    
Acquisition of equipment and leasehold improvements (280) (216)
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements (8) (23)
Net cash used in investing activities (288) (239)
Financing activities:    
Principal payment on capital leases (85) (34)
Proceeds from sale of investment   30
Proceeds from exercise of stock options 26 10
Net cash (used in) provided by financing activities (59) 6
Decrease in cash and cash equivalents (587) (1,414)
Cash and cash equivalents at beginning of period 1,862 3,276
Cash and cash equivalents at end of period 1,275 1,862
Supplemental cash flow information:    
Interest paid 14 6
Supplemental non-cash investing and financing activities:    
Accounts payable incurred for the purchase of equipment and leasehold improvements 37 8
Capital lease obligations incurred in the purchase of equipment $ 132 $ 184