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Leases | 6 Months Ended
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Jun. 30, 2025
Leases |
Leases | Note 13. Leases As of June 30, 2025, the Company had operating leases primarily for its various offices, the manufacturing facilities of ESS Metron and E4A Solutions, a ground lease for the Rockdale Facility, and the Kentucky Facility data center, all of which expire on various dates through January 2032. As of June 30, 2025 and December 31, 2024, operating lease right-of-use assets were $30.8 million and $27.5 million, respectively, and operating lease liabilities were $31.1 million and $28.5 million, respectively. The following table presents the components of the Company’s lease expense. Ground and facilities lease expenses are included in Cost of revenue and office lease expenses are included in Selling, general, and administrative on the Condensed Consolidated Statements of Operations: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended |  | Six Months Ended
​ |  | June 30, |  | June 30,
​ | ​ | 2025 |  | 2024 | ​ | 2025 |  | 2024
Operating lease cost | ​ | $ | 1,917 | ​ | $ | 1,231 | ​ | $ | 3,499 | ​ | $ | 2,429
Variable lease cost | ​ |  | 102 | ​ |  | 150 | ​ |  | 199 | ​ |  | 260
Total lease expense | ​ | $ | 2,019 | ​ | $ | 1,381 | ​ | $ | 3,698 | ​ | $ | 2,689
​ The following table presents supplemental lease information: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | ​ | Six Months Ended
​ | ​ | June 30, | ​ | ​ | June 30,
​ | ​ | 2025 | ​ | 2024 | ​ | ​ | 2025 | ​ | 2024
Operating leases net operating cash outflows | ​ | $ | 2,779 | ​ | $ | 1,007 | ​ | ​ | $ | 4,038 | ​ | ​ | $ | 1,216 | ​
Right-of-use assets exchanged for new operating lease liabilities | ​ | $ | — | ​ | $ | — | ​ | ​ | $ | 5,962 | ​ | ​ | $ | 2,118 | ​
Weighted-average remaining lease term – operating leases | ​ |  | 5.5 | ​ |  | 6.8 | ​ | ​ |  | 5.5 | ​ | ​ |  | 6.8 | ​
Weighted-average discount rate – operating leases | ​ |  | 7.3 | % |  | 6.8 | % | ​ |  | 7.3 | % | ​ |  | 6.8 | %
​ The following table presents the Company’s future minimum operating lease payments as of June 30, 2025: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Ground lease |  | Office and other leases |  | Total
Remainder of 2025 | ​ | $ | 1,028 | ​ | $ | 1,449 | ​ | $ | 2,477
2026 | ​ |  | 2,119 | ​ |  | 4,028 | ​ |  | 6,147
2027 | ​ | ​ | 2,183 | ​ | ​ | 3,433 | ​ | ​ | 5,616
2028 | ​ |  | 2,249 | ​ |  | 2,989 | ​ |  | 5,238
2029 | ​ |  | 2,316 | ​ |  | 2,275 | ​ |  | 4,591
Thereafter | ​ |  | 5,053 | ​ |  | 2,106 | ​ |  | 7,159
Total undiscounted lease payments | ​ |  | 14,948 | ​ |  | 16,280 | ​ |  | 31,228
Less present value discount | ​ |  | (3,273) | ​ |  | 3,193 | ​ |  | (80)
Present value of lease liabilities | ​ | $ | 11,675 | ​ | $ | 19,473 | ​ | $ | 31,148
​ ​

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- Definition The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/842-20/tableOfContent + Details
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