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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Operating activities:    
Consolidated net income (loss) $ 6,822 $ (14,027)
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used for) operating activities:    
Depreciation and amortization 6,954 7,313
Gain from sale of equity method investment (5,000)  
Stock-based compensation expense 1,392 1,173
(Benefit) provision for doubtful accounts (18) 30
Decrease in long-term deferred revenue (103) (104)
Gain on disposal of equipment (54) (6)
Credit gain on available-for-sale securities (12) (39)
Increase (decrease) in long-term income taxes payable 8 (538)
Change in current assets and liabilities, net 2,959 7,649
Net cash provided by operating activities 12,948 1,451
Investing activities:    
Additions to property, plant and equipment (5,596) (4,859)
Proceeds from sale of equity method investment 5,000  
Sales and maturities of investments 360 190
Purchases of investments   (80)
Proceeds from sale of equipment 54 6
Increase in other assets (156) (37)
Net cash used for investing activities (338) (4,780)
Financing activities:    
Proceeds from issuance of Common Stock 781 143
Net cash provided by financing activities 781 143
Effect of foreign exchange rates on cash (7) 33
Net increase (decrease) in cash and cash equivalents 13,384 (3,153)
Cash and cash equivalents at beginning of period 55,187 56,339
Cash and cash equivalents at end of period $ 68,571 $ 53,186