Supplemental Information - Schedule of Long-Lived Assets by Location (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$ 15,366	$ 18,067	$ 18,620
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	8,289	10,372	11,981
Switzerland
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	2,513	5,114	4,346
Israel
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	2,236	2,081	1,915
Germany
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	1,054	190	49
Others
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$ 1,274	$ 310	$ 329