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Significant Customers (Details) - USD ($)
$ / shares in Units, shares in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Concentration Risk [Line Items]      
Accounts receivable $ 205,399,000 $ 153,511,000  
Fair Value Adjustment of Warrants 20,200,000 (95,500,000) $ (2,300,000)
Warrant liability 915,000 103,474,000  
reclassification of liability to equity $ 82,392,000 $ 375,083,000  
DHL [Member] | Revenues from Leases and Contracted Services [Member] | Customer Concentration Risk [Member]      
Concentration Risk [Line Items]      
Percentage of consolidated revenues 12.00% 12.00% 14.00%
DHL [Member] | Accounts Receivable [Member]      
Concentration Risk [Line Items]      
Accounts receivable $ 9,111,000 $ 10,471,000  
Amazon [Member] | Revenues from Leases and Contracted Services [Member] | Customer Concentration Risk [Member]      
Concentration Risk [Line Items]      
Percentage of consolidated revenues 35.00% 30.00% 23.00%
Amazon [Member] | Accounts Receivable [Member]      
Concentration Risk [Line Items]      
Accounts receivable $ 68,429,000 $ 55,997,000  
US Military [Member] | Revenues from Leases and Contracted Services [Member] | Customer Concentration Risk [Member]      
Concentration Risk [Line Items]      
Percentage of consolidated revenues 26.00% 31.00% 34.00%
US Military [Member] | Accounts Receivable [Member]      
Concentration Risk [Line Items]      
Accounts receivable $ 57,998,000 $ 32,625,000  
Amazon Warrant C [Member] [Member]      
Concentration Risk [Line Items]      
Fair value warrants issued   15.49  
Class of Warrant or Right, Outstanding 14,800    
Warrant liability $ (900,000) (103,500,000)  
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 21.53    
Class of Warrant or Right, Unissued 0    
Amazon Warrant Subsequent [Member]      
Concentration Risk [Line Items]      
Class of Warrant or Right, Outstanding 7,000    
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 20.40    
Class of Warrant or Right, Unissued 0    
Amazon Warrant AB and C      
Concentration Risk [Line Items]      
reclassification of liability to equity $ 82,392,000 $ 375,083,000  
Amazon C Warrants      
Concentration Risk [Line Items]      
reclassification of liability to equity $ 82,400,000