Supplemental Information - Schedule of Long-Lived Assets by Location (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$ 15,865	$ 15,366
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	8,152	8,289
Switzerland
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	2,852	2,513
Israel
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	2,473	2,236
Germany
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	871	1,054
Others
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$ 1,517	$ 1,274