Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Common Stock) (Details)

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Stockholders' Equity (Common Stock) (Details)
12 Months Ended
Dec. 31, 2018
vote
Series A common stock  
Class of Stock [Line Items]  
Common stock, voting rights, number of votes 1
Stock conversion ratio 1
Series B common stock  
Class of Stock [Line Items]  
Common stock, voting rights, number of votes 10