Supplemental Information - Schedule of Long-Lived Assets by Location (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$ 15,687	$ 15,366
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	7,973	8,289
Switzerland
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	2,939	2,513
Israel
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	2,428	2,236
Germany
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	958	1,054
Others
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$ 1,389	$ 1,274