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Property and Equipment, Net
9 Months Ended
Sep. 30, 2023
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, 2023December 31, 2022
Production tooling4$15,177 $10,851 
Lab equipment410,607 6,382 
Office equipment
3 - 7
6,120 4,736 
Leasehold improvements*1,824 1,216 
Construction in progress5,120 1,763 
Property and equipment, gross38,848 24,948 
Less: Accumulated depreciation12,935 9,119 
Property and equipment, net$25,913 $15,829 
*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 $1,271 and $753 for the three months ended September 30, 2023 and 2022, respectively. The Company recognized depreciation expense of $3,774 and $2,311 for the nine months ended September 30, 2023 and 2022, 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.