Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Effects of ASC 606 (Details)

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Summary of Significant Accounting Policies - Effects of ASC 606 (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Assets      
Accounts receivable, less allowances $ 123,596 $ 116,580 $ 124,505
Other current assets 15,185 9,393 6,622
Deferred tax assets, net 42,602 44,107 44,887
Other assets 20,393 15,469 11,010
Liabilities      
Current portion of deferred revenue 120,704 112,926 116,622
Stockholders’ equity:      
Accumulated deficit (58,793) (72,825) (75,046)
Balances without adoption of ASU 2014-09      
Assets      
Accounts receivable, less allowances     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)
Adjustments due to ASU 2014-09 | Balances without adoption of ASU 2014-09      
Assets      
Accounts receivable, less allowances 130,742    
Other current assets 8,198    
Other assets 12,114    
Liabilities      
Current portion of deferred revenue 125,078    
Adjustments due to ASU 2014-09 | Effect of Change on Net Income Higher/(Lower)      
Assets      
Accounts receivable, less allowances (7,146) (7,925)  
Other current assets 6,987 2,771  
Deferred tax assets, net   (780)  
Other assets 8,279 4,459  
Liabilities      
Current portion of deferred revenue $ (4,374) (3,696)  
Stockholders’ equity:      
Accumulated deficit   $ 2,221