Certain Balance Sheet Accounts - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 3,499	$ 2,736
Less accumulated depreciation and amortization	(1,610)	(1,018)
Property and equipment, net	1,889	1,718
Tooling and Manufacturing Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	2,220	1,731
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	569	569
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	471	214
Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	213	213
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 26	$ 9