Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Effect of Adoption of 2014-09 on Financial Statements (Details)

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Revenue Recognition - Effect of Adoption of 2014-09 on Financial Statements (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenue            
Total revenue $ 216,252 $ 161,306 $ 417,553 $ 314,225    
Operating expenses:            
Sales and marketing 54,488 39,235 104,729 74,382    
Net income (loss) for period 8,290 3,081 18,890 12,087    
Income tax benefit (189) (3,132) (490) (2,321)    
Net income $ 8,479 $ 6,213 $ 19,380 $ 14,408    
Net income per share:            
Basic (in dollars per share) $ 0.10 $ 0.08 $ 0.23 $ 0.18    
Diluted (in dollars per share) $ 0.09 $ 0.08 $ 0.22 $ 0.18    
Assets            
Accounts receivable, less allowance for doubtful accounts $ 112,484   $ 112,484   $ 116,580 $ 124,505
Other current assets 15,812   15,812   9,393 6,622
Other assets 20,710   20,710   15,469 11,010
Liabilities            
Current portion of deferred revenue 111,238   111,238   112,926 116,622
Deferred revenue 5,181   5,181     5,538
Balances without adoption of ASU 2014-09            
Assets            
Accounts receivable, less allowance for doubtful accounts           124,505
Other current assets           6,622
Other assets           11,010
Liabilities            
Current portion of deferred revenue           $ 116,622
Balances without adoption of ASU 2014-09 | Adjustments due to ASU 2014-09            
Operating expenses:            
Sales and marketing 56,785   108,886      
Net income (loss) for period 5,838   14,151      
Income tax benefit (1,096)   (2,243)      
Net income $ 6,934   $ 16,394      
Net income per share:            
Basic (in dollars per share) $ 0.08   $ 0.20      
Diluted (in dollars per share) $ 0.08   $ 0.19      
Assets            
Accounts receivable, less allowance for doubtful accounts $ 119,930   $ 119,930      
Other current assets 11,085   11,085      
Other assets 14,109   14,109      
Liabilities            
Current portion of deferred revenue 115,161   115,161      
Deferred revenue 5,181   5,181      
Effect of Change on Net Income Higher/(Lower) | Adjustments due to ASU 2014-09            
Operating expenses:            
Sales and marketing 2,297   4,157      
Net income (loss) for period 2,452   4,739      
Income tax benefit (907)   (1,753)      
Net income 1,545   2,986      
Assets            
Accounts receivable, less allowance for doubtful accounts (7,446)   (7,446)   (7,925)  
Other current assets 4,727   4,727   2,771  
Other assets 6,601   6,601   4,459  
Liabilities            
Current portion of deferred revenue (3,923)   (3,923)   $ (3,696)  
Deferred revenue 0   0      
On demand            
Revenue            
Total revenue 206,945 $ 154,727 400,245 $ 300,940    
On demand | Balances without adoption of ASU 2014-09 | Adjustments due to ASU 2014-09            
Revenue            
Total revenue 207,421   400,876      
On demand | Effect of Change on Net Income Higher/(Lower) | Adjustments due to ASU 2014-09            
Revenue            
Total revenue (476)   (631)      
Professional and other            
Revenue            
Total revenue 9,307 6,579 17,308 13,285    
Professional and other | Balances without adoption of ASU 2014-09 | Adjustments due to ASU 2014-09            
Revenue            
Total revenue 8,676   16,095      
Professional and other | Effect of Change on Net Income Higher/(Lower) | Adjustments due to ASU 2014-09            
Revenue            
Total revenue 631   1,213      
Service            
Revenue            
Total revenue 216,252 $ 161,306 417,553 $ 314,225    
Service | Balances without adoption of ASU 2014-09 | Adjustments due to ASU 2014-09            
Revenue            
Total revenue 216,097   416,971      
Service | Effect of Change on Net Income Higher/(Lower) | Adjustments due to ASU 2014-09            
Revenue            
Total revenue $ 155   $ 582