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Significant Customers (Tables)
12 Months Ended
Dec. 31, 2020
Concentration Risk [Line Items]  
Schedule of Stockholders' Equity Note, Warrants or Rights
Issued and outstanding warrants are summarized below as of December 31, 2020:
Common Shares in millions
Exercise priceVestedNon-VestedExpiration
2016 Investment Agreement$9.7314.90.0March 8, 2021
2018 Investment Agreement$21.5314.80.0December 20, 2025
2018 Investment Agreement$20.400.66.4December 20, 2025
Accounts Receivable [Member]  
Concentration Risk [Line Items]  
Schedule of Revenue by Major Customers by Reporting Segments
The accounts receivable from the Company's three largest customers as of December 31, 2020 and 2019 are as follows (in thousands):
Year Ending December 31,
20202019
CustomerAccounts Receivable
DoD$32,625 $44,513 
Amazon55,997 50,036 
DHL10,471 12,688 
Revenue, Product and Service Benchmark [Member]  
Concentration Risk [Line Items]  
Schedule of Revenue by Major Customers by Reporting Segments The percentage of the Company's revenues for the Company's three largest customers, for the years ended December 31, 2020, 2019 and 2018 are as follows:
Year Ended December 31,
202020192018
CustomerPercentage of Revenue
DoD31%34%15%
Amazon30%23%27%
DHL12%14%26%