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Research Funding Agreement - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 06, 2018 | May 31, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Silverstein Foundation | Funding Agreement |  |  |  |  |
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |
Upfront sum of funding amount | $ 500,000 |  |  |  |
Amounts received for qualifying expenses incurred recorded as reduction of research and development expense |  |  |  |  | $ 500,000
National Institute of Health |  |  |  |  |
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |
Grant term |  | 5 years |  |  |
Grant receivable |  | $ 1,500,000 |  |  |
Qualifying expenses |  |  | $ 300,000 | $ 41,000 |
Amounts received for qualifying expenses incurred recorded as other current assets |  |  | 0 | 61,000 |
National Institute of Health | Funding Agreement |  |  |  |  |
Research And Development Arrangement Contract To Perform For Others [Line Items] |  |  |  |  |
Qualifying expenses |  |  | $ 300,000 | $ 100,000 |

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- Definition The amount of compensation earned (contract income) under a research and development arrangement accounted for as a contract to perform research and development for others. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6420387&loc=d3e23221-108380 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420387&loc=d3e23199-108380 + Details
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