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Leases - Additional Information (Detail) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 01, 2018 USD ($) ft² | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) Lease | Jun. 30, 2021 USD ($)
Operating lease, weighted average discount rate, percent |  | 13.00% |  | 13.00% |
Number of new leases | Lease |  |  |  | 0 |
Remaining terms |  | 9 months 18 days |  | 9 months 18 days |
Operating Lease, Payments |  | $ 24 | $ 35 | $ 59 | $ 69
Building [Member] |  |  |  |  |
Leased spaced area | ft² | 5,600 |  |  |  |
Operating lease term | 60 months |  |  |  |
Building [Member] | Minimum [Member] |  |  |  |  |
Operating lease rent expense | $ 10 |  |  |  |
Building [Member] | Maximum [Member] |  |  |  |  |
Operating lease rent expense | $ 12 |  |  |  |
Office Equipment [Member] |  |  |  |  |
Operating lease term |  | 36 months |  | 36 months |
Operating lease rent expense |  | $ 23 | $ 30 | $ 61 | $ 61

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- Definition Remaining lease term of operating lease, 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)(1) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980 + Details
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