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Restructuring Expenses - Additional Information (Details)
$ in Thousands
 6 Months Ended 12 Months Ended 30 Months Ended
Jun. 30, 2015
USD ($)
Lease
Dec. 31, 2013
Employee
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Aug. 18, 2014
USD ($)
May. 22, 2014
USD ($)
Sub-lease 1 | Facility Closing            
Restructuring Cost And Reserve [Line Items]            
Restructuring reserve balance           $ 900
Sub Lease 2 | Facility Closing            
Restructuring Cost And Reserve [Line Items]            
Restructuring reserve balance         $ 700  
Property Subject to Operating Lease            
Restructuring Cost And Reserve [Line Items]            
Restructuring reserve balance $ 1,134   $ 1,134 $ 1,282    
Number of sub leases | Lease 2          
Operating Expense [Member]            
Restructuring Cost And Reserve [Line Items]            
Number of positions eliminated | Employee   59        
Severance costs     5,500      
Accrued Expenses [Member]            
Restructuring Cost And Reserve [Line Items]            
Restructuring reserve balance $ 500   500      
Accrued Expenses [Member] | Sub Lease 2            
Restructuring Cost And Reserve [Line Items]            
Restructuring reserve balance 200   200      
Other Noncurrent Liabilities            
Restructuring Cost And Reserve [Line Items]            
Restructuring reserve balance $ 900   $ 900