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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2023
Accounting Policies [Abstract]  
Revenue Disaggregated by Geography Revenue disaggregated by geography, based on the addresses of the Company’s customers, consists of the following (in thousands):
Three Months Ended September 30, Nine Months Ended September 30,
2023202220232022
United States$68,480 $82,040 $201,585 $195,680 
Rest of World17,668 14,183 49,806 33,688 
$86,148 $96,223 $251,391 $229,368 
Concentration of Customer Risk
RevenueAccounts Receivable
Three Months Ended September 30, Nine Months Ended September 30, September 30,December 31,
202320222023202220232022
Number of customers accounted for 10% or more321232
Total % of customers accounted for 10% or more
62%40%24%27%52%48%
Deferred Revenue
The changes in deferred revenue inclusive of the balance recorded in the liabilities subject to compromise, consisted of the following (in thousands):
Deferred revenue as of December 31, 2022
$67,398 
Revenue recognized from beginning balance during the nine months ended September 30, 2023
(17,336)
Deferred revenue added during the nine months ended September 30, 2023
33,756 
Deferred revenue as of September 30, 2023
$83,818 
Revenue of Commercial Offerings
Revenue of these commercial offerings are as follows (in thousands):
Three Months Ended September 30, Nine Months Ended September 30,
2023202220232022
Proterra Transit$25,770 $56,363 $91,745 $142,563 
Proterra Powered & Energy60,378 39,860 159,646 86,805 
Total$86,148 $96,223 $251,391 $229,368 
Accrued Warranty Activity Activity of the accrued warranty inclusive of the balances in the liabilities subject to compromise, consisted of the following (in thousands):
Nine Months Ended September 30, 2023
Warranty reserve- beginning of period$25,513 
Warranty costs incurred(2,991)
Net changes in liability for pre-existing warranties, including expirations(3,000)
Provision for warranty13,501 
Warranty reserve- end of period$33,023