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Acquisitions (Unaudited) - Summary of Preliminary Allocation of Purchase Price (Detail) - USD ($)
$ in Thousands
Jan. 09, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill   $ 3,685 $ 3,685
Smart Retail [Member] | Subsequent Event [Member]      
Business Acquisition [Line Items]      
Costs incurred on projects not complete $ 48    
Intangible assets 5,229    
Goodwill 4,038    
Total assets 9,315    
Deferred revenue 212    
Total liabilities 212    
Total purchase price $ 9,103