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v3.20.1

OPERATING LEASES (Tables) | 12 Months Ended
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Dec. 31, 2019
Undiscounted future non-cancellable lease payments | The undiscounted future non-cancellable lease payments under the Menlo Park Lease, the New Jersey Lease and the Foster City Lease as of December 31, 2019 were as follows (in thousands):
2020 |  | $ | 713 |
2021 |  |  | 913 |
2022 |  |  | 938 |
2023 |  |  | 962 |
2024 |  |  | 987 |
Thereafter |  |  | 3,762 |
Total lease payments |  | 8,275 |
Less: undiscounted lease payments related to Foster City Lease |  | (4,427 | )
Less: imputed interest |  | (1,294 | )
Total |  | $ | 2,554 |
Menlo Park Lease and New Jersey Lease |
Components of lease costs | The components of lease costs included in operating expenses for the Menlo Park Lease and the New Jersey Lease on our statements of operations were as follows:
|  | Year Ended December 31, |
(In thousands) |  | 2019 |  |  | 2018 |  |  | 2017 |
Operating lease costs | $ | 783 |  |  | $ | 678 |  |  | $ | 661 |
Variable lease costs (1) | 17 |  |  | 31 |  |  | 35 |
Total lease costs | $ | 800 |  |  | $ | 709 |  |  | $ | 696 |
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| (1) | Variable lease costs represent non-lease components, such as common area maintenance charges. |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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