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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Operating activities:    
Consolidated net income (loss) $ (3,575) $ 6,822
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used for) operating activities:    
Depreciation and amortization 6,384 6,954
Gain from sale of equity method investment   (5,000)
Stock-based compensation expense, net 171 1,392
Increase in other assets (505)  
Decrease in long-term deferred revenue (76) (103)
Deferred income taxes (51)  
Benefit for doubtful accounts (22) (18)
Loss (gain) on disposal of equipment 4 (54)
Credit gain on available-for-sale securities (10) (12)
(Decrease) increase in long-term income taxes payable (10) 8
Change in current assets and liabilities, net (3,894) 2,959
Net cash (used for) provided by operating activities (1,584) 12,948
Investing activities:    
Additions to property, plant and equipment (6,368) (5,596)
Proceeds from sale of equity method investment   5,000
Sales and maturities of investments   360
Proceeds from sale of equipment 2 54
Increase in other assets (18) (156)
Net cash used for investing activities (6,384) (338)
Financing activities:    
Proceeds from issuance of Common Stock 455 781
Payment of contingent consideration obligations (64)  
Acquisition of noncontrolling interest (372)  
Net cash provided by financing activities 19 781
Effect of foreign exchange rates on cash 35 (7)
Net (decrease) increase in cash and cash equivalents (7,914) 13,384
Cash and cash equivalents at beginning of period 62,980 55,187
Cash and cash equivalents at end of period $ 55,066 $ 68,571