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Stockholders' Equity (Deficit) (Details) | 12 Months Ended
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Dec. 31, 2017 class vote
Class of Stock [Line Items] |
Number of classes of common stock | class | 2
Class A Common Stock |
Class of Stock [Line Items] |
Common stock votes per share | 1
Class B Common Stock |
Class of Stock [Line Items] |
Common stock votes per share | 10
Rate of conversion | 1

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