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Summary of Significant Accounting Policies - Summary of Operations in Different Geographic Regions (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]    
Long-lived assets $ 3,860 $ 5,213
United States [Member]    
Segment Reporting Information [Line Items]    
Long-lived assets $ 3,860 5,204
Israel [Member]    
Segment Reporting Information [Line Items]    
Long-lived assets   $ 9