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Merger Accounting - Additional Information (Detail)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
shares
Mar. 31, 2018
USD ($)
Mar. 13, 2019
Business Acquisition [Line Items]      
Business acquisition, equity interest     63.70%
Good will $ 27,407    
Business combination, acquisition related costs 1,000    
Pro Forma [Member]      
Business Acquisition [Line Items]      
Business combination, acquisition related costs $ 2,700 $ 2,700  
Arsanis Security Holders [Member]      
Business Acquisition [Line Items]      
Business acquisition, equity interest 31.30%    
XFour Security Holders [Member]      
Business Acquisition [Line Items]      
Business acquisition, equity interest 68.70%    
Arsanis [Member]      
Business Acquisition [Line Items]      
Business acquisition share exchange ratio 0.5702    
Business combination warrants to purchase of common stock | shares 271,230    
Good will $ 27,407