Collaboration, License and Option Agreements	6 Months Ended
Jun. 30, 2021
Collaboration License And Option Agreements [Abstract]
Collaboration, License and Option Agreements	8. Collaboration, License and Option Agreements Global Co-Development and Collaboration Agreement with BeiGene In April 2019, the Company entered into a Global Co-Development and Collaboration agreement (the “BeiGene Collaboration”) with BeiGene, Ltd. and BeiGene Switzerland GmbH (collectively “BeiGene”), a commercial-stage biopharmaceutical company, for the development, manufacturing and commercialization of the Company’s investigational CAB CTLA-4 antibody (BA3071). The Company and BeiGene amended the Global Co-Development and Collaboration agreement in December 2019 and in October 2020 (the “Amended BeiGene Collaboration”). Under the BeiGene Collaboration the Company would co-develop the CAB-CTLA-4 antibody to reach defined early clinical objectives (“POC Milestone”), whereby the Company would perform the development activities (“Development Services”) and BeiGene would reimburse the Company for a portion of the costs incurred by the Company for these Development Services subsequent to the filing of an Investigational New Drug Application (“IND”). Following the POC Milestone, BeiGene would then lead the parties’ joint efforts to develop the product candidate and be responsible for global regulatory filings and commercialization. Subject to the terms of the agreement, BeiGene will hold a co-exclusive license with the Company to develop and manufacture the product candidate globally and an exclusive license to commercialize the product candidate globally. BeiGene will be responsible for all costs of development, manufacturing and commercialization in China, parts of the Middle East and Asia (excluding Japan), Australia and New Zealand (the “BeiGene Territory”), and the parties would share development and manufacturing costs and commercial profits and losses upon specified terms in the rest of the world that are not part of the BeiGene Territory (the “ROW”). Subject to earlier termination, the BeiGene Collaboration shall remain in effect, on a country-by-country basis until the earlier of ten years following commercial sale or upon such time that the parties cease pursuing commercialization. Unless terminated early, at the expiration date BeiGene retains all licensing rights in the applicable territories. BeiGene may terminate the BeiGene Collaboration at any time after the one-year anniversary of the agreement subject to 90 days written notice, or any time subject to 45 days’ notice if it is determined that the proof of concept ("POC") milestone or technological or scientific feasibility will not be achieved. The BeiGene Collaboration also contains customary provisions for termination by either party, including the event of breach of the BeiGene Collaboration, subject to cure. In 2019, BeiGene paid the Company an upfront non-refundable payment of $20.0 million and paid the Company $5.0 million for the reimbursement of manufacturing costs. Under the BeiGene Collaboration, the Company was eligible to receive variable consideration for subsequent development and regulatory milestones globally and commercial milestones in the BeiGene Territory and tiered royalties ranging from the mid-single digits to the mid-double digits based on net sales in the BeiGene Territory. The Company concluded that the BeiGene Collaboration is a contract with a customer and applied relevant guidance from Topic 606 through reaching the POC milestone as the licenses to intellectual property granted to BeiGene and the obligation to perform research and development services are outputs of the Company’s ongoing activities. The Company identified material promises in the BeiGene Collaboration through POC milestone, consisting of the licenses described above and the Development Services. It was determined that the licenses are not distinct from the development services resulting in a single performance obligation. In accordance with Topic 606, the Company determined the transaction price of the agreement is limited to the $25.0 million received, and excluded the variable consideration of expense reimbursements, milestone payments and royalties as they are fully constrained. The expense reimbursements were included in the transaction price in the reporting period the Company concluded it was probable that inclusion of such amounts in the transaction price would not result in a significant reversal in revenue recognized. As part of the Company’s evaluation of the milestone constraints, the Company determined the achievement of such milestones are contingent upon success in future developments, regulatory approvals and commercial activities which are not within its control and are uncertain at this stage. Variable consideration related to royalties will be recognized when the related sales occur. Under the terms of the Amended BeiGene Collaboration, BeiGene is generally responsible for developing BA3071 and is responsible for global regulatory filings and commercialization. Subject to the terms of the Amended BeiGene Collaboration, BeiGene holds an exclusive license with the Company to develop and manufacture the BA3071 candidate globally, and BeiGene is responsible for all costs of development, manufacturing and commercialization globally. The Amended BeiGene Collaboration provides that the Company is eligible to receive tiered royalties, ranging from the high-single digits to the low twenties, on sales worldwide, up to $225.5 million in subsequent development and regulatory milestone payments globally and commercial milestones in the BeiGene territory (reduced from $249 million under the BeiGene Collaboration), and a $5.0 million milestone payment upon the completion of the Company’s amended performance obligations, including the transfer of the master cell bank for BA3071 and other know-how. Under the Amended BeiGene Collaboration, the Company’s amended performance obligation is satisfied at a point in time determined to be when BeiGene has received the know-how and master cell bank for BA3071. Until then BeiGene cannot benefit from the ability to further develop and manufacture the BA3071 candidate. Under the original collaboration agreement, the Company recognized revenue over time using an input method based on actual costs incurred compared to estimated total costs expected to be incurred to fulfill its performance obligation to perform development services. For the three and six months ended June 30, 2021, the Company did not recognize any revenue related to the collaboration agreement with BeiGene. As of June 30, 2021 and December 31, 2020, the Company had $19.8 million of related deferred revenue which was classified as current. The deferred revenue is expected to be earned upon transfer of the know-how and master cell bank within the next twelve months. Service Contracts Prior to developing its own programs, the Company entered into various fixed price research services contracts. In connection with these service contracts, the Company may receive future milestone payments if certain clinical, regulatory and commercialization milestones are achieved. The Company is also eligible to receive royalties based on certain product sales. The Company recognized revenue of $0.3 million, included in Collaboration and Other Revenue, for the three and six months ended June 30, 2021 related to the achievement of a clinical milestone on a fixed price service contract.

Collaboration, License and Option Agreements

6 Months Ended

Jun. 30, 2021

Collaboration License And Option Agreements [Abstract]

Collaboration, License and Option Agreements

8. Collaboration, License and Option Agreements

Global Co-Development and Collaboration Agreement with BeiGene

In April 2019, the Company entered into a Global Co-Development and Collaboration agreement (the “BeiGene Collaboration”) with BeiGene, Ltd. and BeiGene Switzerland GmbH (collectively “BeiGene”), a commercial-stage biopharmaceutical company, for the development, manufacturing and commercialization of the Company’s investigational CAB CTLA-4 antibody (BA3071). The Company and BeiGene amended the Global Co-Development and Collaboration agreement in December 2019 and in October 2020 (the “Amended BeiGene Collaboration”).

Under the BeiGene Collaboration the Company would co-develop the CAB-CTLA-4 antibody to reach defined early clinical objectives (“POC Milestone”), whereby the Company would perform the development activities (“Development Services”) and BeiGene would reimburse the Company for a portion of the costs incurred by the Company for these Development Services subsequent to the filing of an Investigational New Drug Application (“IND”). Following the POC Milestone, BeiGene would then lead the parties’ joint efforts to develop the product candidate and be responsible for global regulatory filings and commercialization. Subject to the terms of the agreement, BeiGene will hold a co-exclusive license with the Company to develop and manufacture the

product candidate globally and an exclusive license to commercialize the product candidate globally. BeiGene will be responsible for all costs of development, manufacturing and commercialization in China, parts of the Middle East and Asia (excluding Japan), Australia and New Zealand (the “BeiGene Territory”), and the parties would share development and manufacturing costs and commercial profits and losses upon specified terms in the rest of the world that are not part of the BeiGene Territory (the “ROW”).

Subject to earlier termination, the BeiGene Collaboration shall remain in effect, on a country-by-country basis until the earlier of ten years following commercial sale or upon such time that the parties cease pursuing commercialization. Unless terminated early, at the expiration date BeiGene retains all licensing rights in the applicable territories. BeiGene may terminate the BeiGene Collaboration at any time after the one-year anniversary of the agreement subject to 90 days written notice, or any time subject to 45 days’ notice if it is determined that the proof of concept ("POC") milestone or technological or scientific feasibility will not be achieved. The BeiGene Collaboration also contains customary provisions for termination by either party, including the event of breach of the BeiGene Collaboration, subject to cure.

In 2019, BeiGene paid the Company an upfront non-refundable payment of $20.0 million and paid the Company $5.0 million for the reimbursement of manufacturing costs. Under the BeiGene Collaboration, the Company was eligible to receive variable consideration for subsequent development and regulatory milestones globally and commercial milestones in the BeiGene Territory and tiered royalties ranging from the mid-single digits to the mid-double digits based on net sales in the BeiGene Territory.

The Company concluded that the BeiGene Collaboration is a contract with a customer and applied relevant guidance from Topic 606 through reaching the POC milestone as the licenses to intellectual property granted to BeiGene and the obligation to perform research and development services are outputs of the Company’s ongoing activities.

The Company identified material promises in the BeiGene Collaboration through POC milestone, consisting of the licenses described above and the Development Services. It was determined that the licenses are not distinct from the development services resulting in a single performance obligation.

In accordance with Topic 606, the Company determined the transaction price of the agreement is limited to the $25.0 million received, and excluded the variable consideration of expense reimbursements, milestone payments and royalties as they are fully constrained. The expense reimbursements were included in the transaction price in the reporting period the Company concluded it was probable that inclusion of such amounts in the transaction price would not result in a significant reversal in revenue recognized. As part of the Company’s evaluation of the milestone constraints, the Company determined the achievement of such milestones are contingent upon success in future developments, regulatory approvals and commercial activities which are not within its control and are uncertain at this stage. Variable consideration related to royalties will be recognized when the related sales occur.

Under the terms of the Amended BeiGene Collaboration, BeiGene is generally responsible for developing BA3071 and is responsible for global regulatory filings and commercialization. Subject to the terms of the Amended BeiGene Collaboration, BeiGene holds an exclusive license with the Company to develop and manufacture the BA3071 candidate globally, and BeiGene is responsible for all costs of development, manufacturing and commercialization globally. The Amended BeiGene Collaboration provides that the Company is eligible to receive tiered royalties, ranging from the high-single digits to the low twenties, on sales worldwide, up to $225.5 million in subsequent development and regulatory milestone payments globally and commercial milestones in the BeiGene territory (reduced from $249 million under the BeiGene Collaboration), and a $5.0 million milestone payment upon the completion of the Company’s amended performance obligations, including the transfer of the master cell bank for BA3071 and other know-how.

Under the Amended BeiGene Collaboration, the Company’s amended performance obligation is satisfied at a point in time determined to be when BeiGene has received the know-how and master cell bank for BA3071. Until then BeiGene cannot benefit from the ability to further develop and manufacture the BA3071 candidate. Under the original collaboration agreement, the Company recognized revenue over time using an input method based on actual costs incurred compared to estimated total costs expected to be incurred to fulfill its performance obligation to perform development services.

For the three and six months ended June 30, 2021, the Company did not recognize any revenue related to the collaboration agreement with BeiGene. As of June 30, 2021 and December 31, 2020, the Company had $19.8 million of related deferred revenue which was classified as current. The deferred revenue is expected to be earned upon transfer of the know-how and master cell bank within the next twelve months.

Service Contracts

Prior to developing its own programs, the Company entered into various fixed price research services contracts. In connection with these service contracts, the Company may receive future milestone payments if certain clinical, regulatory and commercialization milestones are achieved. The Company is also eligible to receive royalties based on certain product sales. The Company recognized

revenue of $0.3 million, included in Collaboration and Other Revenue, for the three and six months ended June 30, 2021 related to the achievement of a clinical milestone on a fixed price service contract.