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Financial Instruments - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Apr. 30, 2018
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |  |
Warrants to purchase common stock |  | 1,592,840 |  | 1,592,840 |  | 1,297,151 |
Fair value of warrants |  | $ 202 | $ 37 | $ 200 | $ 50 |  |
Compensation Warrant [Member] |  |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |  |
Warrants to purchase common stock | 50,000 |  |  |  |  |  |
Warrant exercise price | $ 3.01 |  |  |  |  |  |
Fair value of warrants |  | 59 |  | 59 |  |  |
Warrant exercisable date | Dec. 31, 2021 |  |  |  |  |  |
Performance Warrant [Member] |  |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |  |
Warrants to purchase common stock | 400,000 |  |  |  |  |  |
Warrant exercise price | $ 3.01 |  |  |  |  |  |
Fair value of warrants |  | $ 43 |  | $ 43 |  |  |
Warrant exercisable | 133,333 |  |  |  |  |  |
Warrant exercisable date | Dec. 31, 2023 |  |  |  |  |  |
April 2018 Warrant [Member] |  |  |  |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |  |  |  |
Warrants to purchase common stock |  |  |  |  |  |  | 20,000
Warrant exercise price |  |  |  |  |  |  | $ 11.73
Fair value of warrants |  |  |  |  |  |  | $ 207

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- Definition Date the warrants or rights are exercisable, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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