Income Taxes - Significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Net operating loss and contribution carryforwards	$ 7,996	$ 5,542
Interest limitation	9,730	2,189
Stock-based compensation	8,946	9,417
Legal settlement	3,161	5,065
Operating leases liabilities	971
Accrued expenses	714	1,484
Interest rate swap	567	0
Other	182	165
Deferred tax assets:	32,267	23,862
Valuation allowance	(11,905)	(12,420)
Total deferred tax assets	20,362	11,442
Investment in joint ventures	(18,387)	(9,784)
Goodwill and intangible amortization	(3,480)	(3,400)
Operating lease right-of-use assets	(971)
Depreciation	(230)	(1,378)
Other	0	(49)
Total deferred tax liabilities	(23,068)	(14,611)
Net deferred tax (liabilities)	$ (2,706)	$ (3,169)