Long-Lived Assets by Geographic Region (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 4,805	$ 3,731
Israel
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	4,026	3,090
France
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	365	279
United States
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	240	331
Other
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 174	$ 31