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Restructuring Charges (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]  
Percentage of current annual salary as cash retention bonus (in hundredths) 50.00%
Current Accrued Expenses [Member]
  
Restructuring Reserve [Roll Forward]  
Severance and restructuring expenses, ending balance $ 1,600,000
Long-Term Accrued Expenses [Member]
  
Restructuring Reserve [Roll Forward]  
Severance and restructuring expenses, ending balance 400,000
Operating Expense [Member]
  
Restructuring Cost and Reserve [Line Items]  
Number of positions eliminated 50
Severance costs 4,000,000
Restructuring Reserve [Roll Forward]  
Severance and restructuring expenses, beginning balance 3,974,000
Restructuring expenses paid by December 31, 2013 (1,955,000)
Severance and restructuring expenses, ending balance $ 2,019,000