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Summary of Operations and Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Stock-based compensation expense $ 7,751 $ 6,429 $ 12,375 $ 12,035      
Prepaid expenses and other current assets 29,747   29,747     $ 34,841  
Deferred revenue 137,131   137,131     139,604  
Retained earnings 111,900   111,900     101,079  
Bad debt expense     (635) $ 472      
Write-offs and other adjustments     100        
Allowance for doubtful accounts 4,000   4,000     4,700  
Chargeback and sales refund allowances 300   300     300  
Deferred rent non-current balance           $ 11,300  
Total lease liability 56,210   56,210   $ 58,000    
Right-of-use assets 44,808   $ 44,808   $ 46,700    
Accounting Standards Update 2014-09              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Prepaid expenses and other current assets             $ 3,700
Deferred revenue             9,900
Retained earnings             $ 6,200
Understatement Of Stock-Based Compensation Expense | Restatement Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Stock-based compensation expense $ 500