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Stock-based compensation - Summary of Activities for Restricted Stock Awards ("RSAs") and Restricted Stock Units ("RSUs") (Details) - Restricted Stock Awards and Restricted Stock Units
3 Months Ended
Jun. 30, 2020
$ / shares
shares
Shares of restricted stock outstanding  
Beginning balance (in shares) | shares 2,311,768
Granted (in shares) | shares 995,650
Vested (in shares) | shares (48,991)
Canceled or forfeited (in shares) | shares (56,104)
Ending balance (in shares) | shares 3,202,323
Weighted-average grant date fair value  
Beginning balance (in USD per share) | $ / shares $ 12.86
Granted (in USD per share) | $ / shares 16.75
Vested (in USD per share) | $ / shares 14.08
Canceled or forfeited (in USD per share) | $ / shares 14.59
Ending balance (in USD per share) | $ / shares $ 14.02