Subsequent Events	12 Months Ended
Dec. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	13. Subsequent Events One Alexandria Square Lease Agreement In January 2022, the Company entered into a Lease Agreement (the “OAS Lease”) with an affiliate of Alexandria Real Estate Equities, Inc. (“ARE”) to lease two buildings (“Building 3” and “Building 4”) to be constructed in connection with One Alexandria Square in La Jolla, California. The two buildings are comprised of office and manufacturing space and will serve as the Company’s future headquarters. The term of the OAS Lease will commence when ARE’s work for Building 3 is substantially complete, which is expected to be November 1, 2024 (the “Commencement Date”). The Company’s obligation to pay rent for Building 3 will begin approximately seven months following the Commencement Date. The Company’s obligation to pay rent for Building 4 will begin 12 months following the Commencement Date, subject to the substantial completion of ARE’s work on Building 4. The Company has an option to accelerate the construction and delivery of Building 4 to be the same date as the Commencement Date and will receive 12 months of base rent abatement on Building 4 if it exercises this option. The initial term of the OAS Lease is 144 months following the Commencement Date. The Company has the one-time option to extend the term of the OAS Lease by 60 months upon prior notice to ARE. The annual base rent under the OAS Lease is initially based on $64.80 per square foot per year, or approximately $7.3 million per year for Building 3 and $6.0 million per year for Building 4, subject to annual increases of 3% and certain other adjustments, and includes tenant improvement and warm shell allowances. Maximum tenant improvement and warm shell allowances total approximately $33 million. The Company will also pay for an estimated $24 million of certain tenant improvements plus 7% interest per year amortized in equal monthly payments over the term of the OAS Lease. At the time of entering into the OAS Lease, the Company paid ARE $1.1 million as prepayment for rent and, as a security deposit, provided ARE with a $1.1 million standby letter of credit. Deerfield Exchange Agreement In January 2022, the Company entered into an Exchange Agreement (the “Exchange Agreement”) with Deerfield Private Design Fund IV, L.P. (the “Deerfield Holder”), pursuant to which the Deerfield Holder exchanged an aggregate of 2,500,000 shares of the Company’s common stock held by the Deerfield Holder for 2,500 shares of a newly created class of non-voting preferred stock designated as Series A Common Stock Equivalent Convertible Preferred Stock. Additionally, in connection with the issuance of the Series A Common Stock Equivalent Convertible Preferred Stock, the Company filed a Certificate of Designation, Preferences and Rights of Series A Convertible Preferred Stock, par value $0.0001 per share, of the Company with the Secretary of State of the State of Delaware.

Subsequent Events

12 Months Ended

Dec. 31, 2021

13. Subsequent Events

One Alexandria Square Lease Agreement

In January 2022, the Company entered into a Lease Agreement (the “OAS Lease”) with an affiliate of Alexandria Real Estate Equities, Inc. (“ARE”) to lease two buildings (“Building 3” and “Building 4”) to be constructed in connection with One Alexandria Square in La Jolla, California. The two buildings are comprised of office and manufacturing space and will serve as the Company’s future headquarters.

The term of the OAS Lease will commence when ARE’s work for Building 3 is substantially complete, which is expected to be November 1, 2024 (the “Commencement Date”). The Company’s obligation to pay rent for Building 3 will begin approximately seven months following the Commencement Date. The Company’s obligation to pay rent for Building 4 will begin 12 months following the

Commencement Date, subject to the substantial completion of ARE’s work on Building 4. The Company has an option to accelerate the construction and delivery of Building 4 to be the same date as the Commencement Date and will receive 12 months of base rent abatement on Building 4 if it exercises this option. The initial term of the OAS Lease is 144 months following the Commencement Date. The Company has the one-time option to extend the term of the OAS Lease by 60 months upon prior notice to ARE. The annual base rent under the OAS Lease is initially based on $64.80 per square foot per year, or approximately $7.3 million per year for Building 3 and $6.0 million per year for Building 4, subject to annual increases of 3% and certain other adjustments, and includes tenant improvement and warm shell allowances. Maximum tenant improvement and warm shell allowances total approximately $33 million. The Company will also pay for an estimated $24 million of certain tenant improvements plus 7% interest per year amortized in equal monthly payments over the term of the OAS Lease. At the time of entering into the OAS Lease, the Company paid ARE $1.1 million as prepayment for rent and, as a security deposit, provided ARE with a $1.1 million standby letter of credit.

Deerfield Exchange Agreement

In January 2022, the Company entered into an Exchange Agreement (the “Exchange Agreement”) with Deerfield Private Design Fund IV, L.P. (the “Deerfield Holder”), pursuant to which the Deerfield Holder exchanged an aggregate of 2,500,000 shares of the Company’s common stock held by the Deerfield Holder for 2,500 shares of a newly created class of non-voting preferred stock designated as Series A Common Stock Equivalent Convertible Preferred Stock. Additionally, in connection with the issuance of the Series A Common Stock Equivalent Convertible Preferred Stock, the Company filed a Certificate of Designation, Preferences and Rights of Series A Convertible Preferred Stock, par value $0.0001 per share, of the Company with the Secretary of State of the State of Delaware.