Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Schedule of Adjustments Due to Change in Accounting Policy (Details)

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Summary of Significant Accounting Policies - Schedule of Adjustments Due to Change in Accounting Policy (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Assets            
Accounts receivable, less allowance for doubtful accounts $ 112,484   $ 116,580 $ 124,505    
Other current assets 15,812   9,393 6,622    
Deferred tax assets, net 42,607   44,107 44,887    
Other assets 20,710   15,469 11,010    
Liabilities            
Current portion of deferred revenue 111,238   112,926 116,622    
Stockholders’ equity:            
Accumulated deficit (53,445)   (72,825) (75,046)    
Statement of Cash Flows for the six months ended June 30, 2017            
Net cash provided by operating activities 102,220 $ 95,652        
Net cash used in investing activities (161,768) (150,370)        
Cash, cash equivalents and restricted cash at end of period 475,692 431,070   165,345 $ 431,070 $ 188,540
Previously Reported            
Statement of Cash Flows for the six months ended June 30, 2017            
Net cash provided by operating activities   80,464        
Net cash used in investing activities   (158,007)        
Cash, cash equivalents and restricted cash at end of period         324,591  
Adjustments due to accounting standards update 2016-18            
Statement of Cash Flows for the six months ended June 30, 2017            
Net cash provided by operating activities   15,188        
Net cash used in investing activities   $ 7,637        
Cash, cash equivalents and restricted cash at end of period         $ 106,479  
Balances without adoption of ASU 2014-09            
Assets            
Accounts receivable, less allowance for doubtful accounts       124,505    
Other current assets       6,622    
Deferred tax assets, net       44,887    
Other assets       11,010    
Liabilities            
Current portion of deferred revenue       116,622    
Stockholders’ equity:            
Accumulated deficit       $ (75,046)    
Balances without adoption of ASU 2014-09 | Adjustments due to ASU 2014-09            
Assets            
Accounts receivable, less allowance for doubtful accounts 119,930          
Other current assets 11,085          
Other assets 14,109          
Liabilities            
Current portion of deferred revenue 115,161          
Effect of Change on Net Income Higher/(Lower) | Adjustments due to ASU 2014-09            
Assets            
Accounts receivable, less allowance for doubtful accounts (7,446)   (7,925)      
Other current assets 4,727   2,771      
Deferred tax assets, net     (780)      
Other assets 6,601   4,459      
Liabilities            
Current portion of deferred revenue $ (3,923)   (3,696)      
Stockholders’ equity:            
Accumulated deficit     $ 2,221