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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating activities:    
Consolidated net loss $ (5,426) $ (4,986)
Adjustments to reconcile consolidated net loss to net cash provided by (used for) operating activities:    
Depreciation and amortization 2,443 2,494
Stock-based compensation expense 234 263
Provision for doubtful accounts 53  
Decrease in long-term deferred revenue (34) (35)
Deferred income taxes   (2,264)
Severance charges   1,361
Excess tax benefit of stock-based compensation   (43)
Gain on disposal of equipment (4) (3)
Credit loss (gain) on available-for-sale securities   (1)
(Decrease) increase in long-term income taxes payable (2) 10
Change in current assets and liabilities, net (1,744) 1,523
Net cash used for operating activities (4,480) (1,681)
Investing activities:    
Additions to property, plant and equipment (1,554) (1,171)
Sales and maturities of investments   234
Proceeds from sale of equipment 4 3
Decrease in other assets (34) 47
Net cash used for investing activities (1,584) (887)
Financing activities:    
Purchases of Common Stock   (10,392)
Proceeds from issuance of Common Stock 5 43
Excess tax benefit of stock-based compensation   46
Net cash provided by (used for) financing activities 5 (10,303)
Effect of foreign exchange rates on cash 27 (280)
Net decrease in cash and cash equivalents (6,032) (13,151)
Cash and cash equivalents at beginning of period 56,339 84,554
Cash and cash equivalents at end of period $ 50,307 $ 71,403