Net Loss per Share (Details) - shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Antidilutive securities
Anti-dilutive securities excluded from the calculation of net loss per share	2,371,662	12,836,543
Convertible preferred units
Antidilutive securities
Anti-dilutive securities excluded from the calculation of net loss per share		10,536,765
Incentive units
Antidilutive securities
Anti-dilutive securities excluded from the calculation of net loss per share		2,292,164
Restricted common stock
Antidilutive securities
Anti-dilutive securities excluded from the calculation of net loss per share	863,317
Warrant
Antidilutive securities
Anti-dilutive securities excluded from the calculation of net loss per share	7,614	7,614
Stock options
Antidilutive securities
Anti-dilutive securities excluded from the calculation of net loss per share	1,500,731