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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	14. Subsequent Events Amendment to credit facility On October 10, 2018, the Company entered into a Refinancing Facility Agreement (“2018 Credit Facility”), comprising a $220.0 million term loan (the Term Loan”) and $75.0 million revolving credit facility. Loans under the 2018 Credit Facility accrue interest based upon, at the Company’s option, either at an alternate base interest rate (“ABR”) or a Eurocurrency rate, in each case plus an applicable margin. The applicable margin for the Term Loan is 2.75% in the case of a ABR loan and 3.75% in the case of a Eurocurrency loan, and the applicable margin for the revolving loan ranges from 0.75% to 1.50% in the case of a ABR loan and 1.75 to 2.50% in the case of a Eurocurrency loan, and is based on the Company’s leverage ratio. The Company will make quarterly principal payments of $550,000 on the Term Loans with any remaining principal amounts due on October 10, 2025. The principal amount on the revolving credit facility is due and all revolver commitments terminate on October 10, 2023. Upon execution of the 2018 Credit Facility, the Company utilized a portion of its IPO proceeds to repay $101.3 million of debt outstanding under the 2017 Credit Facility.