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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Operating activities:    
Consolidated net income (loss) $ 4,213 $ (10,358)
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used for) operating activities:    
Depreciation and amortization 4,723 4,854
Stock-based compensation expense 1,051 771
Provision for doubtful accounts 8 11
Decrease in long-term deferred revenue (69) (69)
Gain on disposal of equipment (52) (6)
Credit gain on available-for-sale securities (8) (20)
Increase in long-term income taxes payable 2 7
Change in current assets and liabilities, net 2,408 2,589
Net cash provided by (used for) operating activities 12,276 (2,221)
Investing activities:    
Additions to property, plant and equipment (3,324) (3,481)
Sales and maturities of investments 360 90
Proceeds from sale of equipment 52 6
Increase in other assets (75) (32)
Net cash used for investing activities (2,987) (3,417)
Financing activities:    
Proceeds from issuance of Common Stock 685 20
Net cash provided by financing activities 685 20
Effect of foreign exchange rates on cash (13) 84
Net increase (decrease) in cash and cash equivalents 9,961 (5,534)
Cash and cash equivalents at beginning of period 55,187 56,339
Cash and cash equivalents at end of period $ 65,148 $ 50,805