Shareholder's Equity - Organization structure (Details)	May 23, 2018 Vote
Class A Common Stock
Shareholders' Equity
Number of votes per share	1
Executive Officers | Class C Common Stock
Shareholders' Equity
Number of votes per share	3.5
Blueapple | Class B Common Stock
Shareholders' Equity
Percentage of combined voting power	15.90%
MDP | Current and Former Employees | Class D Common Stock
Shareholders' Equity
Number of votes per share	1