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Debt - Two Thousand Sixteen Credit Facility - Additional Information (Details) - 2016 Credit Facility - Revolving Credit Facility - Lender - USD ($)
1 Months Ended 3 Months Ended
Jun. 30, 2018
Mar. 31, 2017
Dec. 31, 2017
Sep. 07, 2016
Debt Instrument [Line Items]        
Borrowing capacity under Credit Facility       $ 73,000,000
Repayments of debt   $ 73,000,000    
Outstanding borrowings $ 0   $ 0  
Credit facility, termination date Jun. 30, 2018