XML 27 R15.htm IDEA: XBRL DOCUMENT
v3.25.2

LEASES | 6 Months Ended
--- | ---
Jun. 30, 2025
Leases |
LEASES | 7) LEASES The Company currently has operating leases for offices in the borough of Manhattan in New York, New York, and Cambridge, Massachusetts, which expire in 2027 and 2028, respectively. For the three and six months ended June 30, 2025 and 2024, the net operating lease expenses were as follows (in thousands): NET OPERATING LEASE EXPENSE
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Operating lease expense |  | $ | 68 |  |  | $ | 1,633 |  |  | $ | 135 |  |  | $ | 3,269 |
Sublease income |  |  | (21 | ) |  |  | (21 | ) |  |  | (42 | ) |  |  | (42 | )
Variable lease expense |  |  | 7 |  |  |  | 332 |  |  |  | 13 |  |  |  | 663 |
Total lease expense |  | $ | 54 |  |  | $ | 1,944 |  |  | $ | 106 |  |  | $ | 3,890 |
Amounts for the three and six months ended June 30, 2024 in the table above include expense related to a sublease that was terminated effective August 31, 2024. The tables below show the beginning balances of the operating ROU assets and lease liabilities as of January 1, 2025 and the ending balances as of June 30, 2025, including the changes during the period (in thousands). OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES
|  | Operating Lease ROU Assets |
Operating lease ROU assets at January 1, 2025 |  | $ | 670 |
Amortization of operating lease ROU assets |  |  | (89 | )
Operating lease ROU assets at June 30, 2025 |  | $ | 581 |
|  | Operating Lease Liabilities |
Operating lease liabilities at January 1, 2025 |  | $ | 684 |
Principal payments on operating lease liabilities |  |  | (91 | )
Operating lease liabilities at June 30, 2025 |  |  | 593 |
Less non-current portion |  |  | (376 | )
Current portion at June 30, 2025 |  | $ | 217 |
As of June 30, 2025, the Company’s operating leases had a weighted-average remaining life of 2.6 years with a weighted-average discount rate of 10.25%. The maturities of the operating lease liabilities are as follows (in thousands): MATURITIES OF OPERATING LEASE LIABILITIES
|  | As of June 30, 2025 |
2025 |  | $ | 137 |
2026 |  |  | 277 |
2027 |  |  | 173 |
2028 |  |  | 82 |
Total payments |  |  | 669 |
Less imputed interest |  |  | (76 | )
Total operating lease liabilities |  | $ | 593 |

X
- References No definition available. + Details
Name: | ERNA_DisclosureLeasesAbstract
Namespace Prefix: | ERNA_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_LesseeOperatingLeasesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration