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Commitments and Contingencies - Additional Information (Detail) - Sep. 30, 2020 $ in Millions | USD ($) | GBP (£)
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Commitments And Contingencies Disclosure [Line Items] |  |
Potential payable amount over the agreement terms based on minimum purchase obligation | $ 164.7 |
Further Indication for AMR101 | Marketing Approval In Europe |  |
Commitments And Contingencies Disclosure [Line Items] |  |
Potential aggregate stock or cash payment | 9.7 | £ 7,500,000
Further Indication for AMR101 | Potential Marketing Approval 1 |  |
Commitments And Contingencies Disclosure [Line Items] |  |
Potential aggregate stock or cash payment | 6.4 | 5,000,000
Further Indication for AMR101 | Potential Marketing Approval 2 |  |
Commitments And Contingencies Disclosure [Line Items] |  |
Potential aggregate stock or cash payment | $ 6.4 | £ 5,000,000

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- Definition The amount the entity has committed to make for future royalty guarantees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 440 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473578&loc=d3e63223-108013 + Details
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