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Earnings (Loss) Per Share Attributable to Common Stockholders - Additional Information (Details)
Nov. 16, 2017
vote
class
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]  
Number of new classes of common stock authorized | class 2
Common stock, conversion ratio 1
IPO | Class A Common Stock  
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]  
Number of votes per share 1
IPO | Class B Common Stock  
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]  
Number of votes per share 10