Supplemental Information - Schedule of Long-Lived Assets by Location (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$ 16,999	$ 18,067
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	9,731	10,372
Switzerland
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	4,211	5,114
Israel
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	2,238	2,081
Others
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$ 819	$ 500