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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net income $ 1,355 $ 755
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 34 51
Stock based compensation 43 27
Changes in operating assets and liabilities:    
Accounts receivable (136) (309)
Inventories (270) 86
Prepaid expenses and other current assets 90 49
Other assets (35) 1
Accounts payable 120 (95)
Accrued liabilities (18) (19)
Deferred revenue (27) (3)
Net cash provided by operations 1,156 543
Cash flows from investing activities:    
Purchases of property and equipment (166) (41)
Net cash used in investing activities (166) (41)
Effect of exchange rate changes on cash and cash equivalents (21) (1)
Increase in cash and cash equivalents 969 501
Cash and cash equivalents, beginning of year 4,435 2,386
Cash and cash equivalents, end of year 5,404 2,887
Supplemental disclosure of non-cash activities    
Income taxes paid $ 22 $ 1