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v3.21.2

Significant Events and Transactions - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 02, 2020 $ / shares shares | Feb. 04, 2020 $ / shares shares | Jan. 31, 2020 patients | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) patients shares | Feb. 04, 2020 € / shares
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 1.0999 |  |  |  |  |  |  |
Proceeds From Issuance Of Common Stock | $ |  |  |  |  |  |  |  | $ 150,000 |
Stock issued during the period, Value | $ |  |  |  | $ 473 | $ 42 | $ (472) | $ 151,023 |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  | 7,838,687 |
Public Offering [member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 7,500,000 |  |  |  |  |  | 4,874,268 |
Public Offering [member] | American Depositary Shares |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  | 9,748,536 |
Public Offering [member] | Outside Europe [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 4,535,581 |  |  |  |  |  |  |
Public Offering [member] | Outside Europe [Member] | American Depositary Shares |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 9,071,162 |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares |  | $ 10.25 |  |  |  |  |  |  |
Over-Allotment Option | Common Stock [Member] |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 338,687 |  |  |  |  |  |  |  |
Over-Allotment Option | American Depositary Shares |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 677,374 |  |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares | $ 10.25 |  |  |  |  |  |  |  |
Global Offering [member] |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |
Stock issued during the period, Value | $ |  |  |  |  |  |  |  | $ 160,700 |
Private Placement [Member] |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share | € / shares |  |  |  |  |  |  |  |  | € 18.63
Stock Issued During Period, Shares, Issued for Services |  | 2,964,419 |  |  |  |  |  |  |
ViaskinTM Clinical Program For Children Aged Between Four to Eleven [Member] |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |
Percentage Of Patients Increased ED From Baseline |  |  | 75.90% |  |  |  |  |  |
Number Of Patients Increased ED From Baseline | patients |  |  |  |  |  |  |  | 107 |
Number Of Patients | patients |  |  |  |  |  |  |  | 141 |
Percentage Of Patients Increased ED Of Minimum Thousand Milligram Peanut Protein By Three Year |  |  | 51.80% |  |  |  |  | 73.00% |
Number Of Patients Observed For Safety Profile Till Date | patients |  |  | 1,000 |  |  |  |  |  |
Treatment Compliance Percentage |  |  | 98.00% |  |  |  |  |  |
Clinical Program Trial Period |  |  | 6 months |  |  |  |  |  |
Minimum | ViaskinTM Clinical Program For Children Aged Between Four to Eleven [Member] |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |
Age Of Child |  |  | 4 years |  |  |  |  |  |
Maximum | ViaskinTM Clinical Program For Children Aged Between Four to Eleven [Member] |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |
Age Of Child |  |  | 11 years |  |  |  |  |  |

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