Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 74,688	$ 68,186
Less accumulated depreciation	51,445	45,221
Total property and equipment, net	23,243	22,965
Asset impairment charge	0	23,378	$ 0
Computer and telecom equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	30,313	29,883
Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 27,339	24,318
Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years
Property and equipment, gross	$ 8,290	8,078
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,711	1,942
Automobiles
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Property and equipment, gross	$ 3,931	3,666
Construction and development in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,104	$ 299
Minimum | Computer and telecom equipment
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Minimum | Software
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Minimum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Maximum | Computer and telecom equipment
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Maximum | Software
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Maximum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years