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Summary of Fair Values of Assets Acquired and Liabilities Assumed at Acquisition (Detail) - USD ($)
$ in Thousands
12 Months Ended
Nov. 01, 2018
Dec. 31, 2018
Feb. 14, 2018
Business Acquisition [Line Items]      
Goodwill   $ 9,286  
Net purchase price   $ 2,027  
3VR      
Business Acquisition [Line Items]      
Cash     $ 195
Accounts receivable     2,029
Inventory     257
Prepaid expenses and other current assets     169
Property and equipment     334
Finite-lived intangibles     6,300
Total identifiable assets acquired     9,284
Accounts payable     (1,590)
Accrued expenses and liabilities     (726)
Deferred revenue     (2,928)
Debt     (3,622)
Total liabilities assumed     (8,866)
Net identifiable assets acquired     418
Goodwill     5,796
Purchase price     6,214
3VR | Trademarks      
Business Acquisition [Line Items]      
Finite-lived intangibles     400
3VR | Customer Relationships      
Business Acquisition [Line Items]      
Finite-lived intangibles     2,900
3VR | Developed Technology      
Business Acquisition [Line Items]      
Finite-lived intangibles     $ 3,000
Thursby Software Systems      
Business Acquisition [Line Items]      
Cash $ 3,485    
Accounts receivable 526    
Inventory 1,361    
Prepaid expenses and other current assets 12    
Finite-lived intangibles 2,400    
Total identifiable assets acquired 7,784    
Accounts payable (31)    
Accrued expenses and liabilities (67)    
Deferred revenue (243)    
Other current liabilities (4,307)    
Total liabilities assumed (4,648)    
Net identifiable assets acquired 3,136    
Goodwill 3,490    
Purchase price 6,626    
Less: cash acquired (3,485)    
Net purchase price 3,141    
Thursby Software Systems | Trademarks      
Business Acquisition [Line Items]      
Finite-lived intangibles 200    
Thursby Software Systems | Customer Relationships      
Business Acquisition [Line Items]      
Finite-lived intangibles 1,500    
Thursby Software Systems | Developed Technology      
Business Acquisition [Line Items]      
Finite-lived intangibles $ 700