Income Taxes - Domestic and Foreign Components of Income Before Provision for Income Taxes (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Contingency [Line Items]
United States		$ (128,210)	$ (113,689)	$ (105,961)
Income (Loss) Attributable to Parent, before Tax		(127,378)	(105,128)	(93,226)
Israel
Income Tax Contingency [Line Items]
Foreign		1,414	2,214	2,791
United Kingdom
Income Tax Contingency [Line Items]
Foreign		1,145	536	5,377
Netherlands
Income Tax Contingency [Line Items]
Foreign		3,629	3,398	(465)
Australia
Income Tax Contingency [Line Items]
Foreign		755	1,663	716
Germany
Income Tax Contingency [Line Items]
Foreign		(6,450)	243	3,854
Other
Income Tax Contingency [Line Items]
Foreign	[1]	$ 339	$ 507	$ 462

[1] Includes Bulgaria, Canada, Japan, France, India, Italy, Singapore, and Spain