Net Loss per Share (Details) - shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Antidilutive securities
Anti-dilutive securities excluded from the calculation of net loss per share	2,494,157	12,475,028
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		1,930,649
Restricted common stock
Antidilutive securities
Anti-dilutive securities excluded from the calculation of net loss per share	1,003,222
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	1,483,321