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Long Term Debt and Loan Commitment (Detail) - USD ($)
Jun. 30, 2021
Mar. 31, 2021
Mar. 31, 2020
May 31, 2019
Long-term Debt, Unclassified [Abstract]        
Principal amount $ 195,200,000 $ 170,100,000    
Principal amount   171,490,000 $ 110,490,000  
Exit fee / end of term charge 5,000,000 1,390,000   $ 5,000.0
Less: unamortized debt discount and issuance costs (13,850,000) (1,210,000) (1,898,000)  
Total debt, net 186,350,000 170,280,000 108,592,000  
Less: current portion 0 0 0  
Total long term debt, net $ 186,350,000 $ 170,280,000 $ 108,592,000