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Business Combinations - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended
Oct. 13, 2015
Apr. 30, 2015
May. 31, 2015
Mar. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]          
Fair value of goodwill       $ 74,943 $ 74,565
Percentage of accrued interest     1.70%    
Related party transaction maturity period     18 months    
Aggregate loan amount     $ 500    
RevelOps, Inc [Member]          
Business Acquisition [Line Items]          
Percentage of shares outstanding acquired 100.00%        
Total consideration $ 68,100        
Cash consideration $ 36,200        
Number of shares issued as part of acquisition 1,252,627        
Fair value of shares issued as part of acquisition $ 27,400        
Value of shares issued and vested with replacement options $ 4,500        
RevelOps, Inc [Member] | Replacement Options [Member]          
Business Acquisition [Line Items]          
Number of shares issued as part of acquisition 221,759        
Logentries [Member]          
Business Acquisition [Line Items]          
Fair value in excess of vested options expensed $ 300        
Fair value of goodwill 59,100        
Fair value of intangible assets 9,400        
Net assets acquired $ (400)        
NT OBJECTives, Inc. [Member]          
Business Acquisition [Line Items]          
Percentage of shares outstanding acquired   100.00%      
Total consideration   $ 6,100      
Cash consideration   $ 3,400      
Number of shares issued as part of acquisition   9,091      
Fair value of goodwill   $ 4,600      
Fair value of intangible assets   2,100      
Net assets acquired   (600)      
Shares issued in connection with business acquisition, value   100      
Additional payment   3,000      
Future cash payment   2,500      
Additional payment   $ 100