Collaborative Research, Development and License Agreements	6 Months Ended
Jun. 30, 2020
Research And Development [Abstract]
Collaborative Research, Development and License Agreements	7. Collaborative Research, Development and License Agreements Serum Institute of India Pvt. Ltd. In June 2017, we entered into an agreement to provide Serum Institute of India Pvt. Ltd. (“SIIPL”) with technical support. In consideration, SIIPL agreed to pay us at an agreed-upon hourly rate for services and reimburse certain out-of-pocket expenses. In addition, we have rights to commercialization of certain potential products manufactured at the SIIPL facility. For the three months ended June 30, 2020, we recognized collaboration revenue of $0.3 million. No collaboration revenue was recognized for the three months ended June 30, 2019. For the six months ended June 30, 2020 and 2019, we recognized collaboration revenue of $0.7 million and $0.1 million, respectively. Merck, Sharp & Dohme Corp. In February 2018, we entered into a Sublicense Agreement (the “Sublicense Agreement”) with Merck. The Sublicense Agreement grants us, under certain non-exclusive U.S. patent rights controlled by Merck which relate to recombinant production of hepatitis B surface antigen, the right to manufacture, use, offer for sale, sell and import HEPLISAV-B in the United States and includes the right to grant further sublicenses. Under the terms of the Sublicense Agreement, we were obligated to pay $21.0 million in three installments. The first, second and third installment of $7.0 million each was paid in February 2018, 2019 and 2020, respectively. The Sublicense Agreement expired in April 2020, at which time the license became perpetual, irrevocable, fully paid-up and royalty free. As of June 30, 2020, the intangible asset has been fully amortized. At December 31, 2019, the intangible asset, net balance was $2.5 million. See Note 5.

Collaborative Research, Development and License Agreements

6 Months Ended

Jun. 30, 2020

Collaborative Research, Development and License Agreements

7. Collaborative Research, Development and License Agreements

Serum Institute of India Pvt. Ltd.

In June 2017, we entered into an agreement to provide Serum Institute of India Pvt. Ltd. (“SIIPL”) with technical support. In consideration, SIIPL agreed to pay us at an agreed-upon hourly rate for services and reimburse certain out-of-pocket expenses. In addition, we have rights to commercialization of certain potential products manufactured at the SIIPL facility. For the three months ended June 30, 2020, we recognized collaboration revenue of $0.3 million. No collaboration revenue was recognized for the three months ended June 30, 2019. For the six months ended June 30, 2020 and 2019, we recognized collaboration revenue of $0.7 million and $0.1 million, respectively.

Merck, Sharp & Dohme Corp.

In February 2018, we entered into a Sublicense Agreement (the “Sublicense Agreement”) with Merck. The Sublicense Agreement grants us, under certain non-exclusive U.S. patent rights controlled by Merck which relate to recombinant production of hepatitis B surface antigen, the right to manufacture, use, offer for sale, sell and import HEPLISAV-B in the United States and includes the right to grant further sublicenses. Under the terms of the Sublicense Agreement, we were obligated to pay $21.0 million in three installments. The first, second and third installment of $7.0 million each was paid in February 2018, 2019 and 2020, respectively. The Sublicense Agreement expired in April 2020, at which time the license became perpetual, irrevocable, fully paid-up and royalty free. As of June 30, 2020, the intangible asset has been fully amortized. At December 31, 2019, the intangible asset, net balance was $2.5 million. See Note 5.