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Restructuring Costs - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended 23 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Restructuring Cost And Reserve [Line Items]              
Restructuring costs $ 0 $ 0 $ (66) $ 33      
Accrued Expenses And Other Current Liabilities              
Restructuring Cost And Reserve [Line Items]              
Balances recorded in accrued expenses and other current liabilities         $ 600    
Other Non-Current Liabilities              
Restructuring Cost And Reserve [Line Items]              
Balances recorded in other non-current liabilities         300    
November 2017 Restructuring Plan              
Restructuring Cost And Reserve [Line Items]              
Restructuring costs         $ 3,500 $ 1,700 $ 5,100
Restructuring cost reversed     $ (100)