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Leases | 12 Months Ended
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Dec. 31, 2021
Leases [Abstract] |
Leases | LEASESWe have recorded right-of-use operating lease assets under three lease agreements. We have evaluated our facility leases and determined that, effective upon the adoption of Topic 842, the leases evaluated are all operating leases. We have performed an evaluation of our other contracts with suppliers and collaborators in accordance with Topic 842 and have determined that, except for the facility leases described below, none of our contracts contain a lease. We have recorded a right-of-use operating lease asset located in Fremont, California under a lease agreement entered into in September 2008 that was amended in December 2012 to extend the lease agreement to September 2016. In September 2014, we signed the second amendment to our facility lease agreement to add space and to extend the lease term through September 2019. In May 2016, we signed a third amendment to our facility lease agreement in Fremont, California to add space and to extend the lease term through September 2021 (the “Third Amendment”). During May 2021, we entered into an additional amendment to the lease for our Fremont, California facility that extended the term of the lease to March 2025. The office space consists of 72,500 square feet, which includes 10,716 square feet added in September 2019. We do not have an option to renew the lease at our current Fremont location beyond March 2025. We have recorded a right-of-use operating lease asset located in Waltham, Massachusetts under a lease agreement entered into in October 2018. The office space consisted of 3,520 square feet with the lease terminating in September 2021. We did not renew the lease at our original Waltham, Massachusetts facility. During April 2021 and May 2021, we recorded right-of-use operating lease assets for a new facility in Waltham, Massachusetts under a lease agreement entered into during December 2020 with lease commencement dates during April and May 2021. The office space consists of 12,864 square feet with the lease terminating in June 2026. We have an option to extend the lease term for one additional five year period. This option to extend the lease term has not been included in the calculation since currently the exercise of the option is uncertain and therefore deemed not probable. We recorded a $1.6 million right-of-use asset and lease liability for the Waltham lease upon commencement of the lease. We have recorded a right-of-use operating lease asset located in Milwaukee, Wisconsin under a lease agreement entered into in October 2020 with a lease commencement date in November 2020. The office space consists of 4,768 square feet with the lease terminating in February 2026. We have an option to extend the lease term by one additional five-year period. This option to extend the lease term has not been included in the calculation since currently the exercise of the option is uncertain and therefore deemed not probable. We recorded a $0.4 million right-of use asset and lease liability for the Milwaukee lease upon commencement of the lease. All of our leases are operating leases and each contain customary rent escalation clauses. Certain of the leases have both lease and non-lease components. We have as elected to account for each separate lease component and the non-lease components associated with that lease component as a single lease component for all classes of underlying assets. The following table provides additional details of the leases presented in the balance sheets (dollars in thousands):
| As of Dec 31,
Facilities | 2021 |  | 2020
Right-of-use assets | $ | 12,752 |  |  | $ | 2,274 |
Current portion of lease liabilities | 3,492 |  |  | 2,117 |
Operating lease liability, net of current portion | 9,748 |  |  | 413 |
Total | $ | 13,240 |  |  | $ | 2,530 |
Weighted-average remaining life (years) | 3.40 |  | 1.50
Weighted-average discount rate | 6.9 | % |  | 11.7 | %
The lease costs, which are included in operating expenses in our statements of operations, were as follows (in thousands):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Operating lease expense | $ | 3,671 |  |  | $ | 2,608 |  |  | $ | 2,592 |
Cash paid for operating lease | $ | 3,438 |  |  | $ | 3,065 |  |  | $ | 2,645 |
The following table summarizes our undiscounted cash payment obligations for our operating lease liabilities as of December 31, 2021 (in thousands):
Ending December 31, |  |
2022 |  | $ | 4,292 |
2023 |  | 4,440 |
2024 |  | 4,589 |
2025 |  | 1,321 |
2026 |  | 252 |
Thereafter |  | — |
Total undiscounted operating lease payments |  | 14,894 |
Imputed interest expenses |  | (1,654) |
Total operating lease liabilities |  | 13,240 |
Less: Current portion of operating lease liability |  | (3,492) |
Operating lease liability, net of current portion |  | $ | 9,748 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 + Details
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