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Stock-based compensation -Restricted Stock Units Activity (Detail) - Restricted stock units
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Number of Shares    
Number of shares, Outstanding Beginning Balance | shares   569
Number of shares, granted | shares   315
Number of shares, vested | shares   (121)
Number of shares, forfeited | shares   (27)
Number of shares, Outstanding Ending Balance | shares 569 736
Expected to vest, Outstanding | shares   736
Weighted average grant date fair value per share    
Weighted average grant date fair value price per share, Outstanding Beginning Balance | $ / shares   $ 32.96
Weighted average grant date fair value price per share, granted | $ / shares   106.80
Weighted average grant date fair value price per share, vested | $ / shares   36.47
Weighted average grant date fair value price per share, forfeited | $ / shares   79.88
Weighted average grant date fair value price per share, Outstanding Ending Balance | $ / shares $ 32.96 62.27
Weighted average grant date fair value price per share, Expected to vest | $ / shares   $ 62.27
Weighted average remaining contractual term (years)    
Weighted average remaining contractual term, Outstanding 3 years 2 months 12 days 3 years 1 month 6 days
Weighted average remaining contractual term, Expected to vest   3 years 1 month 6 days
Aggregate Intrinsic Value    
Aggregate intrinsic value, Outstanding | $ $ 43,260 $ 91,209
Aggregate intrinsic value, Expected to vest | $   $ 91,209