Property and Equipment - Property and Equipment by Geography (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 3,613	$ 11,418
United States
Property, Plant and Equipment [Line Items]
Property and equipment, net	742	1,259
Germany
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 2,871	$ 10,159

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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