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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Income Tax Disclosure [Line Items] |  |  |  |
Effective tax rate | (0.10%) | (18.10%) | (0.19%) | (1.27%)
Valuation allowance |  |  | $ 303,287 | $ 187,831
Valuation allowance increase (decrease) |  |  | 115,500 | 168,000
Unrecognized tax benefits |  |  | 0 | $ 0
United States and Local Jurisdiction [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Net operating losses |  |  | $ 69,700 |
Minimum | United States and Local Jurisdiction [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Net operating losses expiration date |  |  | Mar. 31, 2035 |
Maximum | United States and Local Jurisdiction [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Net operating losses expiration date |  |  | Mar. 31, 2041 |
Switzerland [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Net operating losses |  |  | $ 1,181,100 |
United States [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Net operating losses |  |  | $ 122,200 |
Percentage of future taxable income |  |  | 80.00% |
Research and development tax credit carryforwards |  |  | $ 19,100 |
United States [Member] | Minimum |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Research and development tax credit expiration date |  |  | Mar. 31, 2035 |
United States [Member] | Maximum |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Research and development tax credit expiration date |  |  | Mar. 31, 2041 |
United Kingdom [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Net operating losses |  |  | $ 28,600 |
Other Jurisdictions [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Net operating losses |  |  | $ 75,800 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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