Income Taxes - Components of Deferred Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating loss carryforwards	$ 33,692	$ 33,803
Allowance for doubtful accounts	8,107	6,526
Non-deductible accruals	2,427	4,980
Operating lease obligations	4,842	0
Stock based compensation expense	4,191	3,337
Transaction costs	2,030	2,186
Research and development and AMT credit carryforwards	275	1,092
Deferred revenue and deferred rent	111	1,019
Capital loss carryforwards	2,718	2,114
Other, net	785	917
Total deferred tax assets	59,178	55,974
Less valuation allowance	(3,877)	(3,021)
Net deferred tax assets	55,301	52,953
Deferred tax liabilities:
Intangible assets	(31,463)	(29,663)
Property and equipment	(6,907)	(3,173)
Right-of-use assets	(4,132)	0
Prepaid insurance	(173)	(142)
Total deferred tax liabilities	(42,675)	(32,978)
Net deferred tax asset	$ 12,626	$ 19,975