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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2023
Accounting Policies [Abstract]  
Revenue from External Customers by Geographic Areas Revenue disaggregated by geography, based on the addresses of the Company’s customers, consists of the following (in thousands):
Three Months Ended March 31,
20232022
United States$65,424 $51,967 
Rest of World14,105 6,614 
$79,529 $58,581 
Revenue disaggregated by geography, based on the addresses of the Company’s customers, consists of the following (in thousands):
Year Ended December 31,
202220212020
United States$265,049 $227,091 $141,073 
Rest of World44,315 15,769 55,870 
Total$309,364 $242,860 $196,943 
Concentration of Customer Risk
RevenueAccounts Receivable
Three Months Ended March 31, March 31,December 31,
2023202220232022
Number of customers accounted for 10% or more3 2 4 2 
Total % for customers accounted for 10% or more34 %40 %49 %48 %
Given the large order value for customers and the relatively low number of customers, revenue and accounts receivable have typically been concentrated with a limited number of customers.
RevenueAccounts Receivable
Year Ended December 31,
December 31,
20222021202020222021
Number of customers accounted for 10% or more2 — 1 2 1 
Total % for customers accounted for 10% or more
32 %— %21 %48 %18 %
Deferred Revenue
The changes in deferred revenue consisted of the following (in thousands):
Deferred revenue as of December 31, 2022
$67,398 
Revenue recognized from beginning balance during the three months ended March 31, 2023
(6,815)
Deferred revenue added during the three months ended March 31, 2023
24,812 
Deferred revenue as of March 31, 2023
$85,395 
The changes in deferred revenue consisted of the following (in thousands):
Deferred revenue as of December 31, 2021
$36,406 
Revenue recognized from beginning balance during the year ended December 31, 2022
(13,071)
Deferred revenue added during the year ended December 31, 2022
44,063 
Deferred revenue as of December 31, 2022
$67,398 
Accrued Warranty Activity Accrued warranty activity consisted of the following (in thousands):
Three Months Ended March 31, 2023
Warranty reserve - beginning of period$25,513 
Warranty costs incurred(868)
Net changes in liability for pre-existing warranties, including expirations— 
Provision for warranty3,604 
Warranty reserve - end of period$28,249 
Accrued warranty activity consisted of the following (in thousands):
Year Ended December 31,
202220212020
Warranty reserve – beginning of period$23,274 $18,582 $14,926 
Warranty costs incurred(7,142)(7,199)(4,214)
Net changes in liability for pre-existing warranties, including expirations(5,124)(1,710)(3,392)
Provision for warranty14,505 13,601 11,262 
Warranty reserve – end of period$25,513 $23,274 $18,582 
Property, Plant and Equipment, Net
Property, plant, and equipment, net, consisted of the following (in thousands):
March 31, 2023December 31, 2022
Computer hardware
$6,020 $5,465 
Computer software
12,813 11,012 
Internally used vehicles and charging systems
15,177 15,177 
Leased vehicles and batteries
5,142 5,142 
Leasehold improvements
30,883 10,716 
Machinery and equipment
54,195 28,942 
Office furniture and equipment
3,282 2,523 
Tooling
23,971 22,430 
Finance lease right-of-use assets
878 179 
Construction in progress
29,209 72,505 
181,570 174,091 
Less: Accumulated depreciation and amortization
(71,145)(66,539)
Total
$110,425 $107,552 
Depreciation is computed using the straight-line method over the estimated useful lives of the respective assets, as follows:
Property, Plant, and EquipmentEstimated Useful Life
Computer hardware3 years
Computer software
3 to 5 years
Internally used vehicles and charging systems
over the shorter of their estimated useful lives or 5 years
Machinery and equipment
5 to 12 years
Office furniture and equipment5 years
Tooling
3 to 5 years
Leasehold improvementsover the shorter of their estimated useful lives or the terms of the related leases
Leased batteries
over the shorter of the terms of the related leases or 12 years
Leased vehicles and charging systems
over the shorter of the terms of the related leases or 5 years
Property, plant, and equipment, net, consisted of the following (in thousands):
December 31,
20222021
Computer hardware$5,465 $5,195 
Computer software11,012 9,561 
Internally used vehicles and charging systems15,177 16,459 
Leased vehicles and batteries5,142 6,863 
Leasehold improvements10,716 10,516 
Machinery and equipment28,942 28,302 
Office furniture and equipment2,523 1,861 
Tooling22,430 21,726 
Finance lease right-of-use assets179 179 
Construction in progress72,505 20,243 
174,091 120,905 
Less: Accumulated depreciation and amortization(66,539)(58,659)
Total$107,552 $62,246 
Revenue of Commercial Offerings
Revenue of these commercial offerings are as follows (in thousands):
Three Months Ended March 31,
20232022
Proterra Transit$44,862 $35,381 
Proterra Powered & Energy34,667 23,200 
Total$79,529 $58,581 
The revenue of these commercial offerings are as follows (in thousands):
Year Ended December 31,
202220212020
Proterra Transit$191,087 $195,558 $156,021 
Proterra Powered & Energy118,277 47,302 40,922 
Total$309,364 $242,860 $196,943 
Accumulated Other Comprehensive Income (Loss)
The components of accumulated other comprehensive income (loss) and activity, net of related taxes, for the year ended December 31, 2022 were as follows (in thousands):
December 31, 2021Increase/ DecreaseDecember 31, 2022
Net unrealized gain (loss) on available-for-sale securities$(588)$43 $(545)
Total accumulated other comprehensive income (loss), net of taxes$(588)$43 $(545)