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Acquisitions - Summary of Preliminary Allocation of Purchase Price (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 09, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 7,797   $ 3,685
Smart Retail [Member]      
Business Acquisition [Line Items]      
Costs incurred on projects not complete   $ 53  
Intangible assets   5,229  
Goodwill   4,112  
Total assets   9,394  
Deferred revenue   291  
Total liabilities   291  
Total purchase price   $ 9,103