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OPERATING LEASES (Tables) | 12 Months Ended
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Dec. 31, 2023
Leases [Abstract] |
Components of lease costs | The components of lease costs included in operating expenses on our consolidated statements of operations for the New Jersey Lease, the Foster City Lease and a lease from a former location in Menlo Park, California, were as follows:
|  | Year Ended December 31, |
(In thousands) |  | 2023 |  |  | 2022 |  |  | 2021 |
Operating lease costs | $ | 962 |  |  | $ | 944 |  |  | $ | 946 |
Variable lease costs (1) |  | 344 |  |  |  | 310 |  |  |  | 252 |
Total lease costs | $ | 1,306 |  |  | $ | 1,254 |  |  | $ | 1,198 |
(1) Variable lease costs represent non-lease components, such as common area maintenance charges.
Undiscounted future non-cancellable lease payments | The undiscounted future non-cancellable lease payments under the New Jersey Lease and the Foster City Lease as of December 31, 2023 were as follows (in thousands):
2024 |  | $ | 987 |
2025 |  |  | 1,014 |
2026 |  |  | 1,040 |
2027 |  |  | 716 |
2028 |  |  | 376 |
Thereafter |  |  | 675 |
Total lease payments |  | 4,808 |
Less: imputed interest |  | (853 | )
Total |  | $ | 3,955 |

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-6 + Details
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