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Income Taxes (Details Textual) (USD $)
Dec. 31, 2012
Operating Loss Carryforwards [Line Items]  
Tax benefits expired $ 30,500,000
Unrecognized tax benefits that would impact effective tax rate 1,500,000
Federal [Member]
  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforwards that will expire due to IRC Section 382 limitations 108,000,000
California [Member]
  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforwards that will expire due to IRC Section 382 limitations 37,400,000
Pennsylvania [Member]
  
Operating Loss Carryforwards [Line Items]  
Net operating loss carryforwards that will expire due to IRC Section 382 limitations 61,000,000
Research Tax Credit Carryforward [Member] | Federal [Member]
  
Operating Loss Carryforwards [Line Items]  
Tax credit carryforward amount 863,000
Research Tax Credit Carryforward [Member] | State [Member]
  
Operating Loss Carryforwards [Line Items]  
Tax credit carryforward amount $ 1,900,000