Fair Value Measurement - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Level 1 \| Embedded derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Embedded derivatives	$ 0	$ 0
Level 1 \| Delayed Draw Term Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Delayed Draw Term Loan	0	0
Level 1 \| SPA Warrant
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Warrants liability	0	0
Level 1 \| Contingent Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Warrants liability	0	0
Level 1 \| IPO, April, May and December 2023 Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Warrants liability	0	0
Total liabilities	0	0
Level 2 \| Embedded derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Embedded derivatives	0	0
Level 2 \| Delayed Draw Term Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Delayed Draw Term Loan	0	0
Level 2 \| SPA Warrant
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Warrants liability	0	0
Level 2 \| Contingent Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Warrants liability	0	0
Level 2 \| IPO, April, May and December 2023 Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Warrants liability	397	269
Total liabilities	397	269
Level 3 \| Embedded derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Embedded derivatives	31,040	44,396
Level 3 \| Delayed Draw Term Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Delayed Draw Term Loan	83,058	76,188
Level 3 \| SPA Warrant
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Warrants liability	467,837	188,857
Level 3 \| Contingent Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Warrants liability	0	77,773
Level 3 \| IPO, April, May and December 2023 Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Warrants liability	402,799	189,322
Total liabilities	$ 984,734	$ 576,536

Eos Energy Enterprises, Inc. 10-Q