Supplemental Information - Schedule of Long-Lived Assets by Location (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$ 18,067	$ 18,620	$ 12,581
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	10,372	11,981	6,600
Switzerland
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	5,114	4,346	4,204
Israel
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	2,081	1,915	1,376
Others
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$ 500	$ 378	$ 401