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Restructuring Expenses - Additional Information (Details)
 3 Months Ended 12 Months Ended
Aug. 18, 2014
USD ($)
May. 22, 2014
USD ($)
Mar. 31, 2016
USD ($)
Lease
Dec. 31, 2013
USD ($)
Employee
Dec. 31, 2015
USD ($)
Restructuring Cost And Reserve [Line Items]          
Severance costs       $ 5,500,000  
Restructuring reserve balance     $ 985,000   $ 1,110,000
Property Subject to Operating Lease [Member]          
Restructuring Cost And Reserve [Line Items]          
Restructuring reserve balance     $ 985,000   1,039,000
Number of sub leases | Lease     2    
Other non-current liabilities [Member] | Property Subject to Operating Lease [Member]          
Restructuring Cost And Reserve [Line Items]          
Restructuring reserve balance     $ 800,000    
Accrued Expenses [Member] | Property Subject to Operating Lease [Member]          
Restructuring Cost And Reserve [Line Items]          
Restructuring reserve balance     200,000    
Operating Expense [Member]          
Restructuring Cost And Reserve [Line Items]          
Number of positions eliminated | Employee       59  
Employee Costs [Member]          
Restructuring Cost And Reserve [Line Items]          
Restructuring reserve balance     $ 0   $ 71,000
Facility Closing [Member] | Sub-lease 1 [Member]          
Restructuring Cost And Reserve [Line Items]          
Restructuring reserve charges   $ 900,000      
Facility Closing [Member] | Sub Lease 2 [Member]          
Restructuring Cost And Reserve [Line Items]          
Restructuring reserve charges $ 700,000