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Organization and Summary of Significant Accounting Policies - Revenues from Strategic Partnering Collaboration Agreements and Research Activity Grants (Detail) - Revenue from Contract with Customer - Revenue From Collaboration Agreements, Grants And Licensing Concentration Risk [Member] | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pfizer |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of revenues | 40.00% | 47.00% | 47.00%
Kite Pharma, Inc. ("Kite") |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of revenues | 34.00% | 30.00% |
Sanofi |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of revenues | 22.00% | 16.00% | 34.00%

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