v3.10.0.1
Acquisitions - Summary of the Fair Values of Tangible Assets Acquired, Liabilities Assumed, Intangible Assets and Goodwill (Details) - USD ($)
$ in Thousands
Feb. 28, 2018
Nov. 30, 2017
Nov. 21, 2017
Sep. 30, 2018
Dec. 31, 2017
Fair value of assets acquired and liabilities assumed          
Goodwill       $ 460,596 $ 297,704
Wombat          
Fair value of assets acquired and liabilities assumed          
Current assets $ 23,344        
Fixed assets 954        
Liabilities (1,120)        
Deferred revenue (14,700)        
Deferred tax liability, net (14,725)        
Goodwill 162,865        
Recognized identifiable assets acquired and liabilities assumed, net 238,818        
Wombat | Customer Relationships          
Fair value of assets acquired and liabilities assumed          
Finite lived intangible assets $ 37,800        
Acquired finite-lived intangible assets, weighted average useful life (in years) 7 years        
Wombat | Order Backlog          
Fair value of assets acquired and liabilities assumed          
Finite lived intangible assets $ 6,800        
Acquired finite-lived intangible assets, weighted average useful life (in years) 2 years        
Wombat | Developed Technology          
Fair value of assets acquired and liabilities assumed          
Finite lived intangible assets $ 35,200        
Acquired finite-lived intangible assets, weighted average useful life (in years) 4 years        
Wombat | Trade Names          
Fair value of assets acquired and liabilities assumed          
Finite lived intangible assets $ 2,400        
Acquired finite-lived intangible assets, weighted average useful life (in years) 4 years        
Cloudmark          
Fair value of assets acquired and liabilities assumed          
Current assets     $ 37,390    
Fixed assets     543    
Non-current assets     50    
Liabilities     (4,569)    
Deferred revenue     (15,400)    
Deferred tax liability, net     (7,905)    
Goodwill     93,947    
Recognized identifiable assets acquired and liabilities assumed, net     139,256    
Cloudmark | Customer Relationships          
Fair value of assets acquired and liabilities assumed          
Finite lived intangible assets     $ 15,300    
Acquired finite-lived intangible assets, weighted average useful life (in years)     8 years    
Cloudmark | Order Backlog          
Fair value of assets acquired and liabilities assumed          
Finite lived intangible assets     $ 1,400    
Acquired finite-lived intangible assets, weighted average useful life (in years)     1 year    
Cloudmark | Developed Technology          
Fair value of assets acquired and liabilities assumed          
Finite lived intangible assets     $ 18,500    
Acquired finite-lived intangible assets, weighted average useful life (in years)     4 years    
WebLife Balance, Inc.          
Fair value of assets acquired and liabilities assumed          
Current assets   $ 534      
Fixed assets   23      
Liabilities   (88)      
Deferred revenue   (700)      
Deferred tax liability, net   (4,440)      
Goodwill   36,514      
Recognized identifiable assets acquired and liabilities assumed, net   49,043      
WebLife Balance, Inc. | Customer Relationships          
Fair value of assets acquired and liabilities assumed          
Finite lived intangible assets   $ 600      
Acquired finite-lived intangible assets, weighted average useful life (in years)   5 years      
WebLife Balance, Inc. | Developed Technology          
Fair value of assets acquired and liabilities assumed          
Finite lived intangible assets   $ 16,600      
Acquired finite-lived intangible assets, weighted average useful life (in years)   5 years