Equity-Based Compensation - Summary of Activity Related to Stock Options (Details ) - Stock options - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Shares
Outstanding at the beginning of the period (in shares)	209,759
Options exercised (in shares)	(82,776)
Options forfeited/cancelled (in shares)	(600)
Outstanding and exercisable at the end of the period (in shares)	126,383	209,759
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 2.98
Options exercised (in dollars per share)	2.92
Options forfeited/canceled (in dollars per share)	2.89
Outstanding and exercisable at the end of the period (in dollars per share)	$ 3.02	$ 2.98
Weighted-Average Remaining Contractual Term (Years)
Outstanding		4 years 5 months 20 days
Exercisable at the end of the period	3 years 5 months 20 days