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 ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenue            
Total revenue $ 224,953 $ 169,058 $ 642,506 $ 483,283    
Operating expenses:            
Sales and marketing 43,179 36,802 121,523 102,548    
Net income (loss) for period 9,756 (439) 28,646 11,648    
Income tax expense (benefit) 683 (7,273) 193 (9,594)    
Net income 9,073 6,834 28,453 21,242    
Assets            
Accounts receivable, less allowance for doubtful accounts 114,441   114,441   $ 116,580 $ 124,505
Other current assets 17,834   17,834   9,393 6,622
Other assets 18,992   18,992   15,469 11,010
Liabilities            
Current portion of deferred revenue 110,507   110,507   112,926 116,622
Deferred revenue 5,079   5,079     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 45,213   127,714      
Net income (loss) for period 7,325   21,476      
Income tax expense (benefit) (216)   (2,459)      
Net income 7,541   23,935      
Assets            
Accounts receivable, less allowance for doubtful accounts 121,816   121,816      
Other current assets 11,997   11,997      
Other assets 11,446   11,446      
Liabilities            
Current portion of deferred revenue 114,779   114,779      
Deferred revenue 5,079   5,079      
Effect of Change on Net Income Higher/(Lower) | Adjustments due to ASU 2014-09            
Operating expenses:            
Sales and marketing 2,034   6,191      
Net income (loss) for period 2,431   7,170      
Income tax expense (benefit) 899   2,652      
Net income 1,532   4,518      
Assets            
Accounts receivable, less allowance for doubtful accounts (7,375)   (7,375)   (7,925)  
Other current assets 5,837   5,837   2,771  
Other assets 7,546   7,546   4,459  
Liabilities            
Current portion of deferred revenue (4,272)   (4,272)   $ (3,696)  
Deferred revenue 0   0      
On demand            
Revenue            
Total revenue 215,413 161,578 615,658 462,518    
On demand | Balances without adoption of ASU 2014-09 | Adjustments due to ASU 2014-09            
Revenue            
Total revenue 215,912   616,788      
On demand | Effect of Change on Net Income Higher/(Lower) | Adjustments due to ASU 2014-09            
Revenue            
Total revenue (499)   (1,130)      
Professional and other            
Revenue            
Total revenue 9,540 7,480 26,848 20,765    
Professional and other | Balances without adoption of ASU 2014-09 | Adjustments due to ASU 2014-09            
Revenue            
Total revenue 8,644   24,739      
Professional and other | Effect of Change on Net Income Higher/(Lower) | Adjustments due to ASU 2014-09            
Revenue            
Total revenue 896   2,109      
Service            
Revenue            
Total revenue 224,953 $ 169,058 642,506 $ 483,283    
Service | Balances without adoption of ASU 2014-09 | Adjustments due to ASU 2014-09            
Revenue            
Total revenue 224,556   641,527      
Service | Effect of Change on Net Income Higher/(Lower) | Adjustments due to ASU 2014-09            
Revenue            
Total revenue $ 397   $ 979