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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current deferred tax assets:    
Vacation accrual $ 27 $ 26
Total current deferred tax assets 27 26
Valuation allowance (27) (26)
Net current deferred tax assets      
Noncurrent deferred tax assets:    
Net operating loss carryforwards 39,799 37,295
Charitable contribution carryforwards 371 368
Research and experimentation credits 820 687
Capitalized intangibles 3,351 3,413
Stock based compensation 454 416
Depreciation and amortization 5 11
Other   25
Total noncurrent deferred tax assets 44,800 42,215
Valuation allowance (44,800) (42,215)
Net noncurrent deferred tax assets      
Deferred tax liabilities:    
Current deferred tax liabilities      
Noncurrent deferred tax liabilities      
Net deferred tax liabilities      
Net noncurrent deferred tax assets