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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2015
Income Taxes Tables  
Schedule of Tax Effects of Temporary Differences that Give Rise to Significant Portions of Deferred Tax Assets and Liabilities

Deferred tax assets are summarized as follows:

      December 31,
      2015     2014
Deferred tax assets, current            
     Reserves   $ 2,581    $ 2,526 
     Other     749      617 
Total gross deferred tax assets, current     3,330      3,143 
             
Deferred tax assets, non-current            
     Net operating loss carryforwards     122,281      116,520 
     R&D credit carryforwards     6,747      6,520 
     Depreciation/amortization deferred     20,848      22,642 
     Other     7,954      7,846 
Total gross deferred tax assets, non-current     157,830      153,528 
             
Net deferred taxes before valuation allowance     161,160      156,671 
Less: Valuation allowance     (161,160)     (156,671)
Deferred tax assets   $   $