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Collaboration and License Agreements and Supply Agreements - Summary of Recognized Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Revenue Recognition Multiple Deliverable Arrangements [Line Items] |  |  |  |  |
Total revenue | [1],[2] | $ 9,469 | $ 10,525 | $ 16,621 | $ 19,154
Collaboration and License Agreements and Supply Agreements |  |  |  |  |
Revenue Recognition Multiple Deliverable Arrangements [Line Items] |  |  |  |  |
Total revenue |  | 9,469 | 10,525 | 16,621 | 19,154
Collaboration and License Agreements and Supply Agreements | Bristol-Myers Squibb Company ("BMS") |  |  |  |  |
Revenue Recognition Multiple Deliverable Arrangements [Line Items] |  |  |  |  |
Total revenue |  | 1,509 | 1,670 | 3,554 | 3,245
Collaboration and License Agreements and Supply Agreements | Merck |  |  |  |  |
Revenue Recognition Multiple Deliverable Arrangements [Line Items] |  |  |  |  |
Total revenue |  | 7,005 | 5,497 | 9,782 | 10,132
Collaboration and License Agreements and Supply Agreements | Vaxcyte, Inc. |  |  |  |  |
Revenue Recognition Multiple Deliverable Arrangements [Line Items] |  |  |  |  |
Total revenue |  | 100 | 0 | 136 | 281
Collaboration and License Agreements and Supply Agreements | Merck KGaA, Darmstadt, Germany “EMD Serono”) |  |  |  |  |
Revenue Recognition Multiple Deliverable Arrangements [Line Items] |  |  |  |  |
Total revenue |  | $ 855 | $ 3,358 | $ 3,149 | $ 5,496
[1] | Includes $0 and $2.8 million, respectively, for the three months and six months ended June 30, 2020 of related party revenue from Merck. Merck was a related party until the closing of the Company’s public offering on May 14, 2020.
[2] | Includes $0 and $36,000, respectively, for the three months and six months ended June 30, 2020 of related party revenue from Vaxcyte (formerly SutroVax). Vaxcyte was a related party until the closing of its initial public offering on June 16, 2020.

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