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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (Parenthetical)
Jun. 30, 2018
$ / shares
Common Stock $.001 Par Value  
Par value of common stock (USD per share) $ 0.001
Class B Convertible Common Stock $.001 Par Value  
Par value of common stock (USD per share) 0.001
Common Stock | Common Stock $.001 Par Value  
Par value of common stock (USD per share) 0.001
Common Stock | Class B Convertible Common Stock $.001 Par Value  
Par value of common stock (USD per share) $ 0.001