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Revenue - Additional Information (Details) - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Breakage, revenue recognition period one 3 months    
Breakage, revenue recognition period two 6 months    
Cumulative effect adjustment     $ 16,475
Deferred revenue increase $ 46,200,000    
Deferred revenue recognized 45,500,000    
Retained Earnings      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect adjustment     16,475
User pay revenue      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Breakage, revenue recognized $ 1,600,000 $ 700,000  
Accounting Standards Update 2014-09 (Topic 606) | Retained Earnings      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect adjustment     $ 20,000