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Revenue Recognition - Schedule of Revenues from Major Customers (Detail) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Largest Customer | HEPLISAV-B |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of product revenue | 28.00% | 40.00% | 28.00% | 25.00%
Second Largest Customer | HEPLISAV-B |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of product revenue | 21.00% | 26.00% | 23.00% | 24.00%
Third Largest Customer | HEPLISAV-B |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of product revenue | 16.00% | 17.00% | 17.00% | 17.00%
Largest Collaboration Partner | CpG 1018 |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of product revenue | 63.00% | 0.00% | 79.00% | 0.00%
Second Largest Collaboration Partner | CpG 1018 |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of product revenue | 27.00% | 0.00% | 15.00% | 0.00%

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