The Company leases office and laboratory space in Wilmington, Delaware under a noncancelable lease (the “Lease”). During the first quarter of 2022, the Lease was amended to allow the Company the option to renew the Lease for two 6-month periods and the Company exercised its option to renew the lease for an additional 6 months until June 30, 2023. The second option to extend the Lease for an additional 6 months was not recognized as part of the Company’s measurement of the right-of-use asset and operating lease liability as of June 30, 2022. The discount rate used to account for the Company’s operating lease under ASC 842 is the Company’s estimated incremental borrowing rate of 6.0%.

Rent expense for the three months ended June 30, 2022 and 2021 was $0.6 million and $0.3 million, respectively. Rent expense for the six months ended June 30, 2022 and 2021 was $1.1 million and $0.7 million, respectively.

Future minimum annual lease payments under the Lease at June 30, 2022 are as follows:

(in thousands)
2022 (remaining)	$	918
2023		964
Total undiscounted lease payments		1,882
Less imputed interest		(60	)
Current and noncurrent lease liability	$	1,822

In August 2022, we entered into an amendment (the “Lease Amendment”) to the lease agreement for office and lab space at Chestnut Run Plaza in Wilmington, Delaware (the “Chestnut Run Lease”). The Chestnut Run Lease has a commencement date of the earlier of (i) the Landlord Work Substantial Completion Date (as such term is defined in the Chestnut Run Lease), or (ii) the date the Company takes possession of the premises for the conduct of the Company’s business (the “Commencement Date”). The Chestnut Run Lease premises includes approximately 81,000 rentable square feet, located at Chestnut Run Plaza in Wilmington, Delaware (the Premises). Upon the Commencement Date, the Company will recognize a right-of-use asset and operating lease liability in accordance with ASC 842. The Chestnut Run Lease has an initial term of 162 months with 3 five-year extension options and certain expansion rights. The Lease Amendment increases the monthly base rent payments due over the initial term of the Chestnut Run Lease to approximately $42.6 million. The estimated rent payments related to the Chestnut Run Lease are as follows:

(in thousands)
2022 (remaining 6 months)	$	—
2023		—
2024		2,370
2025		2,943
2026		3,016
2027		3,092
Thereafter		31,216

The Company paid a security deposit for the Chestnut Run Lease in the form of a letter of credit of $4.0 million, which is included in the balance sheet as restricted cash as of June 30, 2022. The security deposit may be reduced to $0.5 million over time in accordance with the terms of the Chestnut Run Lease.

In connection with the Company’s expansion of operations in the State of Delaware, the Company was approved for a grant from the State of Delaware in 2021 that will provide up to $5.5 million in reimbursements over three years for the development of lab space in addition to increasing jobs in Delaware to meet specific targeted levels through 2023. During the first quarter of 2022, the Company received cash of $2.4 million from the grant for the development of lab space. The Company has deferred the recognition of these grant funds as they relate to capitalized costs and has classified them as long-term liabilities on the balance sheet. The Company will recognize the grant funds in other income as grant income over the useful life of the related assets. If, after two years from the disbursement date, the incurred costs for lab space are less than the $2.4 million received, the Company is required to pay back the difference between total funds received and allowable costs incurred. Additionally, if the Company leaves the State of Delaware within five years of the disbursement, the Company is required to return an amount equal to the amount of grant funds disbursed on a pro-rated basis. During the first quarter of 2022, the Company also received cash of $0.3 million for satisfying the first performance benchmark measurement. The Company recognized this in other income, net on the statement of operations and comprehensive loss.

To the extent the Company’s employee headcount is fewer than the performance benchmark, the Company is required to repay the amount of grant funds received for the number of employees below the benchmark.

The Company entered into employment agreements with key personnel providing for compensation and severance in certain circumstances, as defined in the respective employment agreements.

The Company sponsors a 401(k) defined‑contribution plan covering all employees. Participants are permitted to contribute up to 100% of their eligible annual pretax compensation up to an established federal limit on aggregate participant contributions. The Company provides a safe harbor match with a maximum amount of 3% of the participant’s compensation. For both the three months ended June 30, 2022 and 2021, the Company made matching contributions of $0.1 million. For both the six months ended June 30, 2022 and 2021, the Company made matching contributions of $0.3 million.

In September 2021, the Company entered into a research collaboration agreement estimated to last for approximately one year (the “Darwin Health Agreement”) with Darwin Health, Inc. (“DarwinHealth”). Under the terms of the Darwin Health Agreement, DarwinHealth will utilize their drug discovery technologies and certified methodologies in precision oncology to advance and accelerate clinical development for certain of the Company’s programs across a broad range of tumor subtypes. The Company will pay DarwinHealth a total of $3.0 million in three equal installments over the one-year term (the “Research Term”) to fund the research and, if the Company adopts any of DarwinHealth’s development ideas, the Company will be responsible for the development, manufacturing, and commercialization of any such products. In addition to research funding, DarwinHealth is eligible to receive future research, development and regulatory milestones of up to $3.0 million for each product candidate and is also eligible to receive tiered royalties in the low single digits on net sales of each product developed using DarwinHealth’s development technologies or methods. However, within eighteen-months following the Research Term, the Company, in its sole discretion, may notify DarwinHealth that it will not utilize its development ideas and will be entitled to receive a refund of $0.5 million.

The Company enters into agreements with contract research organizations (“CROs”) to assist in the performance of research and development activities. Expenditures to CROs will represent a significant cost in clinical development for the Company.