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Property and Equipment, Net
3 Months Ended
Mar. 31, 2024
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)March 31, 2024December 31, 2023
Production tooling4$17,217 $16,428 
Lab equipment413,453 12,887 
Office equipment
3 - 7
8,493 6,539 
Leasehold improvements*1,912 1,898 
Construction in progress4,395 3,867 
Property and equipment, gross45,470 41,619 
Less: Accumulated depreciation16,071 14,653 
Property and equipment, net$29,399 $26,966 
*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 $1,485 and $955 for the three months ended March 31, 2024 and 2023, 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.