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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating activities:      
Consolidated net income (loss) $ 5,159 $ (14,070) $ (23,504)
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used for) operating activities:      
Depreciation and amortization 9,142 9,805 10,008
Gain from sale of equity method investment (5,000)    
Gain from disposition of consolidated subsidiary (28)    
Stock-based compensation expense 1,782 1,634 2,450
Decrease in long-term income taxes payable (675) (472) (155)
Deferred income taxes (183) 18 4,491
Decrease in long-term deferred revenue (139) (139) (139)
Gain on disposal of equipment (60) (22) (26)
(Benefit) provision for doubtful accounts (18) 66  
Credit (gain) loss on available for sale securities (12) (311) 78
Change in current assets and liabilities, net 1,499 5,682 2,107
Net cash provided by (used for) operating activities 11,467 2,191 (4,690)
Investing activities:      
Sales and maturities of investments 360 3,460 1,024
Purchases of investments   (340)  
Additions to property, plant and equipment (9,090) (7,128) (6,179)
Proceeds from sale of equity method investment 5,000    
Deconsolidation of subsidiary (392)    
Proceeds from sale of equipment 60 22 26
(Increase) decrease in other assets (204) (43) 49
Net cash used for investing activities (4,266) (4,029) (5,080)
Financing activities:      
Purchases of Common Stock     (17,100)
Proceeds from issuance of Common Stock 820 788 27
Acquisition of noncontrolling interest (216)    
Noncontrolling interest dividends paid   (162) (531)
Reversal of excess tax benefit of share-based compensation     (451)
Net cash provided by (used for) financing activities 604 626 (18,055)
Effect of foreign exchange rates on cash (12) 60 (390)
Net increase (decrease) in cash and cash equivalents 7,793 (1,152) (28,215)
Cash and cash equivalents at beginning of period 55,187 56,339 84,554
Cash and cash equivalents at end of period 62,980 55,187 56,339
Change in assets and liabilities, excluding effects of disposition of consolidated subsidiary:      
Accounts receivable 2,201 (1,151) (821)
Inventories, net 1,880 3,202 33
Other current assets (111) 1,029 (1,647)
Accounts payable and accrued liabilities (1,301) 300 4,580
Accrued severance charges (1,709) 1,855 49
Income taxes payable (10) 26 (321)
Deferred revenue 549 421 234
Change in current assets and liabilities, net 1,499 5,682 2,107
Supplemental disclosures:      
Cash paid during the year for income taxes, net of refunds $ 675 $ (1,529) $ (61)