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Subsequent Events (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
May 19, 2020
Apr. 11, 2016
Mar. 31, 2020
Jun. 30, 2019
Subsequent Event [Line Items]        
Common stock, par value     $ 0.001 $ 0.001
Subscription Agreement [Member]        
Subsequent Event [Line Items]        
Number of shares issued in transaction   9,980,000    
Common stock, par value   $ 0.001    
Sale Of Stock Price Per Share   $ 10.79    
Cash consideration received on transaction   $ 107.7    
Subsequent Event [Member] | Subscription Agreement [Member] | African Capitalization Fund, Ltd [Member]        
Subsequent Event [Line Items]        
Number of shares issued in transaction 2,103,169      
Reclassified amount to additional paid-in-capital, from redeemable common stock sold $ 22.7