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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Operating activities:    
Consolidated net loss $ (1,399) $ (5,926)
Adjustments to reconcile consolidated net loss to net cash used for operating activities:    
Depreciation and amortization 4,346 4,311
Stock-based compensation expense, net 541 669
Increase in other assets   (505)
Increase in other long-term liabilities 87  
Decrease in long-term deferred revenue (35) (58)
(Gain) loss on disposal of equipment (23) 4
Deferred income taxes 17 (51)
Provision (benefit) for doubtful accounts 8 (23)
Decrease in long-term income taxes payable (7) (12)
Credit gain on available-for-sale securities (6) (7)
Change in current assets and liabilities, net (4,232) (2,407)
Net cash used for operating activities (703) (4,005)
Investing activities:    
Additions to property, plant and equipment (5,631) (4,646)
Proceeds from sale of equipment 23 2
(Increase) decrease in other assets (80) 57
Net cash used for investing activities (5,688) (4,587)
Financing activities:    
Proceeds from issuance of Common Stock 1,769 129
Payment of contingent consideration obligations (111) (25)
Acquisition of noncontrolling interest   (372)
Net cash provided by (used for) financing activities 1,658 (268)
Effect of foreign exchange rates on cash (12) 33
Net decrease in cash and cash equivalents (4,745) (8,827)
Cash and cash equivalents at beginning of period 56,170 62,980
Cash and cash equivalents at end of period $ 51,425 $ 54,153