Significant Service Providers (Details) - Service Provider Concentration Risk - Revenue	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Ten Largest Service Providers
Concentration Risk [Line Items]
Concentration risk percentage	46.00%	51.00%	48.00%	52.00%
Minimum | Service Provider A
Concentration Risk [Line Items]
Concentration risk percentage	15.00%	15.00%	15.00%	15.00%
Maximum | Service Provider A
Concentration Risk [Line Items]
Concentration risk percentage	20.00%	20.00%	20.00%	20.00%