Description of Business and Summary of Significant Accounting Policies - Schedule of Disaggregation of Trucking Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 51,951	$ 36,451	$ 107,677	$ 64,827
Trucking [Member]
Disaggregation of Revenue [Line Items]
Total revenue	51,719	36,125	107,125	64,216
Trucking [Member] | USPS [Member]
Disaggregation of Revenue [Line Items]
Total revenue	45,358	32,867	93,541	58,111
Trucking [Member] | Freight Revenue [Member]
Disaggregation of Revenue [Line Items]
Total revenue	5,985	$ 3,258	12,560	$ 6,105
Trucking [Member] | Other Revenue [Member]
Disaggregation of Revenue [Line Items]
Total revenue	$ 376		$ 1,024