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v3.22.1

Related parties -Additional Information (Detail) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 30, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2021 | Mar. 31, 2020
Related Party Transaction [Line Items] |  |  |  |  |
Common stock issued for notes purchased |  | 66,155,340 |  | 92,619,641 | 9,162,976
Related party [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Aggregate principal amount of notes | $ 7,000,000 |  |  |  |
Interest rate of notes | 5.00% |  |  |  |
Term of notes | 5 years |  |  |  |
Interest expense |  | $ 200,000 | $ 300,000 |  |
Common stock issued for notes purchased | 25,000 |  |  |  |
Promissory Notes Purchased | $ 250,000 |  |  |  |
Related party [Member] | Two Board Members [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Aggregate principal amount of notes | $ 6,000,000.0 |  |  |  |

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