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Business Combination - Schedule of Estimated Fair Values of Assets acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Oct. 16, 2017
Sep. 30, 2017
Business Acquisition [Line Items]      
Goodwill $ 10,298   $ 3,014
ICAR Vision Systems, S.L.      
Business Acquisition [Line Items]      
Current assets   $ 2,036  
Property, plant and equipment   83  
Intangible assets   6,407  
Goodwill   6,852  
Other non-current assets   87  
Current liabilities   (1,568)  
Other non-current liabilities   (2,430)  
Total consideration paid   $ 11,467