Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carryforward	$ 43,652	$ 60,280
Accrued expenses	1,270	2,449
Allowance for doubtful accounts	34	127
163(j) Interest expense limitation and carryforward	0	996
Total deferred tax assets	44,956	63,852
Deferred tax liabilities:
Property and equipment	(289)	(427)
Deferred revenue	(1,289)	(3,884)
Intangible assets	(6,907)	(14,099)
Deferred contract acquisition costs	(2,562)	(2,753)
Other	0	(79)
Total deferred tax liabilities	(11,047)	(21,242)
Valuation allowance	(33,116)	(41,875)
Deferred income tax asset, net	$ 793	$ 735