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Commitments and Contingencies - Additional Information (Detail) |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 01, 2018 USD ($) ft² | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2019 USD ($)
Commitment And Contingencies [Line Items] |  |  |  |
Long-term lease agreement, area of office space | ft² | 19,275 |  |  |
Lease term | 11 years |  |  |
Total lease payments | $ 7,300,000 | $ 497,000 |  |
Lessee, operating lease, existence of option to extend | true |  |  |
Renewal term | 5 years |  |  |
Renewal term, description | The Company has the option to renew for two consecutive five-year periods from the end of the first term and the Company is not reasonably certain that the option to renew the Lease will be exercised. Under the Lease, the Company must furnish a security deposit in the form of a standby letter of credit in the amount of $0.3 million, which will be reduced by fifty-five thousand dollars every two years for ten years after the commencement of the lease |  |  |
Security deposit in the form of a standby letter of credit | $ 300,000 |  |  |
Decrease in security deposit | $ 55,000 |  |  |
Operating lease right-of-use asset |  | 3,191,000 | $ 0 | $ 3,365,000
Operating lease liability |  | 3,362,000 |  | $ 3,368,000
Maximum |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |
Milestone payments from the Company |  | $ 19,000,000 |  |
Jersey City, New Jersey |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |
Rent expense |  |  | $ 500,000 |

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- Definition The increase (decrease) during the reporting period in security deposits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition Indicates (true false) whether lessee has option to extend operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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