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Organization and Significant Accounting Policies - Restricted Cash (Details) - USD ($)
Feb. 26, 2020
Feb. 20, 2020
Jun. 10, 2019
Jan. 25, 2020
Apr. 30, 2019
Restricted Cash [Abstract]          
Restricted Cash       $ 5,000,000 $ 0
Pulse Aerospace, LLC          
Restricted Cash [Abstract]          
Each milestone achievement $ 2,500,000 $ 2,500,000      
Cash $ 2,500,000 $ 2,500,000 $ 18,677,000