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Restructuring Costs - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Restructuring Cost And Reserve [Line Items]              
Restructuring costs     $ 0 $ 2 $ 33 $ 147  
Accrued Expenses And Other Current Liabilities              
Restructuring Cost And Reserve [Line Items]              
Balances recorded in accrued expenses and other current liabilities     300   300   $ 1,000
Other Non-Current Liabilities              
Restructuring Cost And Reserve [Line Items]              
Balances recorded in other non-current liabilities     $ 200   $ 200   $ 400
November 2017 Restructuring Plan              
Restructuring Cost And Reserve [Line Items]              
Restructuring costs $ 1,700            
November 2016 Restructuring Plan              
Restructuring Cost And Reserve [Line Items]              
Restructuring costs   $ 1,500