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Restructuring Expenses (Details) (USD $)
 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 21 Months Ended 3 Months Ended
Sep. 30, 2014
Operating Lease [Member]
Jun. 30, 2014
Sub Lease 1 [Member]
Sep. 30, 2014
Employee Costs [Member]
Jun. 30, 2014
Facility Closing [Member]
Sub Lease 1 [Member]
Sep. 30, 2014
Facility Closing [Member]
Sub Lease 2 [Member]
Sep. 30, 2014
Accrued Expenses [Member]
Sep. 30, 2014
Other non-current liabilities [Member]
Sep. 30, 2014
Operating Expense [Member]
Employee
Dec. 31, 2013
Operating Expense [Member]
Employee
Sep. 30, 2014
Operating Expense [Member]
Employee
Jun. 30, 2014
Selling, General and Administrative Expenses [Member]
Contract Termination [Member]
Sub Lease 1 [Member]
Sep. 30, 2014
Selling, General and Administrative Expenses [Member]
Contract Termination [Member]
Sub Lease 2 [Member]
Restructuring Cost and Reserve [Line Items]                        
Number of positions eliminated               8 50 58    
Severance costs                 $ 5,300,000      
Outstanding lease term       81 months 78 months              
Contractual Obligation       3,600,000 3,400,000              
Sub-lease revenue       2,600,000 2,600,000              
Net future cash outflow sub lease rental receipts       1,000,000 800,000              
Restructuring reserve charges 1,547,000   1,327,000 900,000 700,000              
Contract termination costs related to sub-lease                     150,000 150,000
Leasehold improvements written off   50,000                    
Restructuring Reserve [Roll Forward]                        
Restructuring reserve balance 0   2,019,000     300,000 1,100,000          
Charges 1,547,000   1,327,000 900,000 700,000              
Restructuring expenses paid (125,000)   (1,990,000)                  
Restructuring reserve balance $ 1,422,000   $ 1,356,000     $ 300,000 $ 1,100,000