Stock-based Compensation (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||
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Dec. 31, 2018 | |||||||||||||||||||||||||||||
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |||||||||||||||||||||||||||||
| Schedule of Nonvested Shares of Restricted Common Stock Activity | A summary of the status of the nonvested shares of restricted Class A common stock as of December 31, 2017 and the changes for the year ended December 31, 2018 is presented below:
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