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Related Parties - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]          
Receivables (payables) to related parties $ 0   $ 0   $ 0
Board of Directors Chairman          
Related Party Transaction [Line Items]          
Rent reimbursements $ 0 $ 100,000 $ 100,000 $ 100,000