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Commitment and Contingencies - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2020 | Aug. 01, 2019
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Estimated litigation liability |  | $ 0 |  |  | $ 0 |
Amended lease term from the date of relocation |  |  |  |  |  | 7 years
Amended base rent per year of the relocation premises | $ 600,000 |  |  |  |  |
Percentage increase in operating lease base rent | 2.00% |  |  |  |  |
Letters of Credit issued amount | $ 200,000 |  |  |  |  |
Lease payments |  | 500,000 | $ 300,000 | $ 0 |  |
Novartis International Pharmaceutical Ltd. | Maximum |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Aggregate amount payable upon satisfaction of clinical milestones |  | 1,500,000 |  |  |  |
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 |  |  |  |

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- Definition Lessee Operating Lease Percentage Increase In Base Rent + References No definition available. + Details
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- Definition License agreement milestone payments upon satisfaction of clinical milestones payable. + References No definition available. + Details
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- Definition License agreement milestone payments upon satisfaction of commercial milestones payable. + References No definition available. + Details
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- Definition License agreement milestone payments upon satisfaction of regulatory milestones payable for first indication approved. + References No definition available. + Details
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- Definition License agreement milestone payments upon satisfaction of regulatory milestones payable for second indication approved. + References No definition available. + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77910348&loc=d3e34039-112682 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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