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License Agreements - Additional Information (Detail) - Novartis International Pharmaceutical Ltd. - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 23, 2017 | May 31, 2019 | May 31, 2017 | Mar. 31, 2020 | Dec. 31, 2019
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
License agreement termination description |  |  |  | The agreement may be terminated by either party upon a material breach by the other party that is not cured within 60 days after written notice. The Company may terminate the agreement in its entirety or on a product-by-product or country-by-country basis with or without cause with 60 days' prior written notice. | The agreement may be terminated by either party upon a material breach by the other party that is not cured within 60 days after written notice. The Company may terminate the agreement in its entirety or on a product-by-product or country-by-country basis with or without cause with 60 days' prior written notice.
Payment for development milestone |  | $ 2,500,000 | $ 300,000 |  |
Maximum |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Aggregate amount payable upon satisfaction of clinical milestones | $ 4,300,000 |  |  |  |
Aggregate amount payable upon satisfaction of regulatory milestones for first indication approved | 24,000,000 |  |  |  |
Aggregate amount payable upon satisfaction of regulatory milestones for second indication approved | 18,000,000 |  |  |  |
Aggregate amount payable upon satisfaction of commercial milestones | $ 125,000,000 |  |  |  |
License Agreement | Series A Preferred Stock |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |
Shares issued | 2,587,992 |  |  |  |
Fair value of license agreement | $ 3,200,000 |  |  |  |
Fair value of shares issued | $ 1.22 |  |  |  |

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