Geographic Information and Major Customer and Product Data - Long-lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Long-lived assets	$ 27,188	$ 17,323
United States
Segment Reporting Information [Line Items]
Long-lived assets	12,422	7,612
Israel
Segment Reporting Information [Line Items]
Long-lived assets	13,013	7,834
France
Segment Reporting Information [Line Items]
Long-lived assets	1,036	1,243
Other
Segment Reporting Information [Line Items]
Long-lived assets	$ 717	$ 634