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Revenue
 9 Months Ended
Sep. 30, 2025
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Disaggregation of Revenue
The following table summarizes net sales by end market:
(in thousands)For the Three Months Ended September 30,For the Nine Months Ended September 30,
End Market2025202420252024
Power Systems$169,370 $84,111 $432,980 $219,160 
Industrial28,105 32,774 81,492 93,031 
Transportation6,354 8,957 16,710 19,477 
Total$203,829 $125,842 $531,182 $331,668 
The following table summarizes net sales by geographic area:
(in thousands)For the Three Months Ended September 30,For the Nine Months Ended September 30,
Geographic Area2025202420252024
United States$193,053 $113,533 $499,653 $294,295 
North America (outside of United States)4,187 5,824 14,468 16,127 
Pacific Rim5,703 5,595 14,131 17,416 
Europe882 890 2,704 3,781 
Other4 — 226 49 
Total$203,829 $125,842 $531,182 $331,668 
Contract Balances
Most of the Company’s contracts are for a period of less than one year; however, extended warranty contracts extend beyond one year. The timing of revenue recognition may differ from the time of invoicing to customers and these timing differences result in contract assets, or contract liabilities on the Company’s Consolidated Balance Sheets. Contract assets include amounts related to the contractual right to consideration for completed performance when the right to consideration is conditional. The Company records contract liabilities when cash payments are received or due in advance of performance. The fair value of noncash consideration of parts provided by customers is recorded in contract liabilities. Contract assets and contract liabilities are recognized at the contract level.
(in thousands)As of September 30, 2025As of December 31, 2024As of December 31, 2023
Short-term contract assets (included in Contract assets)
$13,265 $21,462 $15,554 
Short-term contract liabilities (included in Other accrued liabilities)
(12,525)(10,184)(2,741)
Long-term contract liabilities (included in Noncurrent contract liabilities)
(1,733)(1,877)(2,401)
Net contract assets (liabilities)$(993)$9,401 $10,412 
During the nine months ended September 30, 2025 and 2024, the Company recognized $10.6 million and $1.4 million, respectively, of revenue upon satisfaction of performance obligations related to amounts that were included in the net contract liabilities balance as of December 31, 2024 and 2023, respectively. During the three months ended September 30, 2025 and 2024, the Company recognized $1.7 million and $0.7 million, respectively, of revenue upon satisfaction of performance obligations related to amounts that were included in the net contract liabilities balance as of June 30, 2025 and 2024, respectively.
Remaining Performance Obligations
The Company has elected the practical expedient to not disclose remaining performance obligations that have expected original durations of one year or less. For performance obligations that extend beyond one year, the Company had $2.1 million of remaining performance obligations as of September 30, 2025, primarily related to extended warranties. The Company expects to recognize revenue related to these remaining performance obligations of approximately $0.2 million in the remainder of 2025, $0.2 million in 2026, $1.5 million in 2027, $0.2 million in 2028, and none in 2029 and beyond.