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Collaborative Research, Development and License Agreements - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2019 USD ($) | Feb. 28, 2018 USD ($) Installment | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Revenue recognized |  |  |  | $ 10,575,000 | $ 1,461,000 | $ 24,649,000 | $ 2,880,000 |
Intangible assets, net |  |  |  | 4,823,000 |  | 4,823,000 |  | $ 11,717,000
Serum Institute of India Pvt. Ltd. | Collaboration Revenue |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Revenue recognized |  |  |  |  |  | 100,000 | $ 0 |
Merck, Sharp & Dohme Corp. | Sublicense Agreement |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Aggregate amount payable to acquire intangible assets |  | $ 21,000,000.0 |  |  |  |  |  |
Number of installments | Installment |  | 3 |  |  |  |  |  |
Payment upon obligation | $ 7,000,000.0 | $ 7,000,000.0 |  |  |  |  |  |
Intangible assets, net |  |  |  | $ 4,800,000 |  | $ 4,800,000 |  | $ 11,700,000
Merck, Sharp & Dohme Corp. | Sublicense Agreement | Scenario, Forecast |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |
Payment upon obligation |  |  | $ 7,000,000.0 |  |  |  |  |

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