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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities      
Net loss $ (5,062) $ (3,950) $ (5,370)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 696 734 812
Provision for inventory obsolescence 502 178 157
Gain on disposal of property and equipment, net 5 21 21
Stock based compensation 871 809 575
Change in fair value of derivative liabilities (183) (64) (1,799)
Provision for allowance for doubtful accounts 179 84 96
Provision (benefit) for deferred taxes (196) 25 (25)
Changes in current assets and liabilities:      
Trade receivables (303) (1,894) (1,029)
Prepaid expenses (83) 103 286
Inventories (870) (379) (102)
Deposits and other assets 53 341 228
Accounts payable (23) 392 (189)
Accrued severance and related 1,242 0 0
Accrued and other liabilities (532) 763 553
Net cash used in operating activities (3,704) (2,837) (5,786)
Cash flows from investing activities      
Purchases of technology, property and equipment (624) (286) (421)
Acquisition of Bovie Bulgaria, net of cash acquired 0 0 (500)
Net cash used in investing activities (624) (286) (921)
Cash flows from financing activities      
Proceeds from stock options/warrants exercised 0 124 1,427
Change in restricted cash 60 60 60
Repayment of mortgage note payable (239) (240) (239)
Proceeds from issuance of common shares, net 0 5,830 11,531
Net cash (used in) provided by financing activities (179) 5,774 12,779
Net change in cash and cash equivalents (4,507) 2,651 6,072
Cash and cash equivalents, beginning of period 14,456 11,805 5,733
Cash and cash equivalents, end of period 9,949 14,456 11,805
Cash paid for:      
Interest paid 136 158 158
Non cash investing activities:      
Note payable for acquisitions 0 0 140
Cashless exercise of stock options/warrants $ 557 $ 698 $ 272