Income Tax - Schedule of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Investment in subsidiary	$ 17,980	$ 16,715
Tax receivable agreement	3,991	3,789
Stock compensation	694	694
Net operating loss carryforwards	3,165	2,230
Allowance for doubtful accounts	5	4
Other	2	165
Total deferred tax assets	25,837	23,597
Less valuation allowances	(9,250)	(12,799)
Deferred tax assets, net of valuation allowance	16,587	10,798
Deferred tax liabilities:
Identifiable intangible assets	(1,197)	(2,383)
Stock compensation	(423)	(225)
Other	(7)	(9)
Deferred tax assets, net	$ 14,960	$ 8,181