Supplemental Information - Schedule of Long-Lived Assets by Location (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$ 17,922	$ 18,067
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	9,950	10,372
Switzerland
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	5,178	5,114
Israel
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	2,112	2,081
Others
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$ 682	$ 500