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Property and Equipment, Net
 9 Months Ended
Sep. 30, 2022
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net Property and Equipment, Net
Property and equipment, net consists of the following:
Useful life (in years)September 30, 2022December 31, 2021
Production tooling4$10,055 $10,158 
Lab equipment45,484 4,489 
Office equipment
3 - 7
3,460 1,893 
Leasehold improvements*702 395 
Construction in progress1,111 256 
Property and equipment, gross20,812 17,191 
Less: Accumulated depreciation8,303 6,101 
Property and equipment, net$12,509 $11,090 
*Leasehold improvements are amortized over the shorter of the remaining lease term or estimated useful life of the leasehold improvement.
The Company recognized depreciation expense of $753 and $254 for the three months ended September 30, 2022 and 2021, respectively. The Company recognized depreciation expense of $2,311 and $685 for the nine months ended September 30, 2022 and 2021, respectively.

Fixed assets not yet in service consist primarily of capitalized internal-use software and certain tooling and other equipment that have not been placed into service.