Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment
Total cost	$ 25,728	$ 24,359
Accumulated depreciation and amortization	16,697	15,664
Property & equipment, net	$ 9,031	$ 8,695
Furniture, fixtures and equipment
Property, Plant and Equipment
Useful life	5 years	5 years
Total cost	$ 1,364	$ 1,354
Corporate office leasehold improvements
Property, Plant and Equipment
Useful life	3 years	3 years
Total cost	$ 5,156	$ 5,156
Internal-use software
Property, Plant and Equipment
Useful life	3 years	3 years
Total cost	$ 8,243	$ 7,947
Computer equipment
Property, Plant and Equipment
Useful life	3 years	3 years
Total cost	$ 1,265	$ 1,265
Residence vehicles
Property, Plant and Equipment
Useful life	5 years	5 years
Total cost	$ 390	$ 315
Residence leasehold improvements
Property, Plant and Equipment
Useful life	3 years	3 years
Total cost	$ 9,310	$ 8,322