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Subsequent Events (Details) - Subsequent Event
Jan. 21, 2019
shares
Subsequent Event [Line Items]  
Transition agreement period 17 years
Class B common stock  
Subsequent Event [Line Items]  
Number of shares that were agreed to be converted (in shares) 1,000,000
Percent of shares required to be converted by the end of every two years 15.00%
Percent of shares required to be converted by December 31, 2020 15.00%
Percent of shares required to be converted by December 31, 2022 30.00%
Percent of shares required to be converted by December 31, 2024 45.00%
Class B common stock converted to Class A common stock (in shares) 200,000