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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