Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Nov. 30, 2019
Class of Stock [Line Items]          
Stock repurchase program, authorized amount         $ 5,000,000.0
Economic interest percentage     29.80%    
Non-controlling interest holders          
Class of Stock [Line Items]          
Economic interest percentage     70.20%    
Common Class B          
Class of Stock [Line Items]          
Antidilutive securities (in shares) 3,724,329 5,988,485 3,724,329 5,988,485  
Class C Common Stock          
Class of Stock [Line Items]          
Antidilutive securities (in shares) 77,791,218 77,791,218 77,791,218 77,791,218  
Stock Options          
Class of Stock [Line Items]          
Antidilutive securities (in shares) 1,078,154 166,827 1,078,154 166,827