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Restructuring Costs - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended 17 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2019
Restructuring Cost And Reserve [Line Items]          
Restructuring costs $ (66) $ 5      
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)