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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 | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pfizer |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of revenues | 40.00% | 40.00% | 47.00%
Biogen MA Inc |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of revenues | 24.00% | 0.00% | 0.00%
Kite Pharma, Inc. ("Kite") |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of revenues | 24.00% | 34.00% | 30.00%
Novartis Institutes For Bio Medical Research Inc |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of revenues | 4.00% | 0.00% | 0.00%
Sanofi |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of revenues | 5.00% | 22.00% | 16.00%

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