Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Nov. 30, 2019
Class of Stock [Line Items]          
Stock repurchase program, authorized amount         $ 5,000,000.0
Economic interest percentage     31.00%    
Non-controlling interest holders          
Class of Stock [Line Items]          
Economic interest percentage     69.00%    
Class B Common Stock          
Class of Stock [Line Items]          
Antidilutive securities (in shares) 3,590,909 5,988,485 3,590,909 5,988,485  
Class C Common Stock          
Class of Stock [Line Items]          
Antidilutive securities (in shares) 76,489,218 77,791,218 76,489,218 77,791,218  
Stock Options          
Class of Stock [Line Items]          
Antidilutive securities (in shares) 1,356,781 632,847 1,356,781 632,847