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Restructuring Expenses - Additional Information (Details)
$ in Thousands
 12 Months Ended
Aug. 18, 2014
USD ($)
May 22, 2014
USD ($)
Dec. 31, 2018
USD ($)
Lease
Dec. 31, 2017
USD ($)
Property Subject to Operating Lease [Member]        
Restructuring Cost And Reserve [Line Items]        
Number of sub leases | Lease     2  
Restructuring reserve balance     $ 396 $ 604
Sub-lease 1 [Member] | Facility Closing [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring reserve charges   $ 900    
Sub Lease 2 [Member] | Facility Closing [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring reserve charges $ 700      
Other non-current liabilities [Member] | Property Subject to Operating Lease [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring reserve balance     200  
Accrued Expenses [Member] | Property Subject to Operating Lease [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring reserve balance     $ 200