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		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 52,389	$ 47,256	$ 160,066	$ 112,083
Trucking [Member]
Disaggregation of Revenue [Line Items]
Total revenue	52,133	47,159	159,258	111,375
Trucking [Member] | USPS [Member]
Disaggregation of Revenue [Line Items]
Total revenue	45,607	42,037	139,148	100,148
Trucking [Member] | Freight Revenue [Member]
Disaggregation of Revenue [Line Items]
Total revenue	6,224	5,028	18,784	11,133
Trucking [Member] | Other Revenue [Member]
Disaggregation of Revenue [Line Items]
Total revenue	$ 302	$ 94	$ 1,326	$ 94