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Composition of Certain Balance Sheet Items - Schedule of Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Composition of Certain Balance Sheet Items [Abstract]    
Payroll and related expenses $ 6,629 $ 3,774
Professional services 435 325
Deferred rent 363 284
Other 1,128 520
Other current liabilities $ 8,555 $ 4,903