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Organization and Significant Accounting Policies - (Details) - USD ($)
$ in Thousands
Sep. 15, 2021
Jan. 29, 2022
Apr. 30, 2021
Feb. 19, 2019
Restricted cash   $ 1,823 $ 8,322  
Altoy        
Ownership interest 85.00%      
Toygun Savunma Sanayi ve Havacilik Anonim Sirketi        
Percentage of shares sold 35.00%      
Toygun Savunma Sanayi ve Havacilik Anonim Sirketi | Altoy        
Ownership interest 50.00%      
Arcturus UAV Inc.        
Ownership interest acquired       100.00%