Property, Machinery and Equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, machinery and equipment, gross	$ 6,299		$ 6,299		$ 3,103
Less: accumulated depreciation	(1,513)		(1,513)		(782)
Property, machinery and equipment, net	4,786		4,786		2,321
Depreciation expense	300	$ 100	700	$ 400
Computer equipment
Property, Plant and Equipment [Line Items]
Property, machinery and equipment, gross	178		178		178
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, machinery and equipment, gross	206		206		206
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, machinery and equipment, gross	2,533		2,533		665
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, machinery and equipment, gross	3,136		3,136		1,936
Construction in-progress
Property, Plant and Equipment [Line Items]
Property, machinery and equipment, gross	$ 245		$ 245		$ 118