XML 51 R77.htm IDEA: XBRL DOCUMENT v3.20.1
Stock-based compensation - Summary of Restricted Stock Unit Activity and Related Information (Details) - RSAs and RSUs - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2020
Shares of restricted stock outstanding    
Beginning balance (in shares) 2,036,124 2,786,398
Granted (in shares) 1,464,710 673,461
Vested (in shares) (396,514) (762,818)
Canceled forfeited (in shares) (317,922) (385,273)
Ending balance (in shares) 2,786,398 2,311,768
Weighted-average grant date fair value    
Beginning balance (in USD per share) $ 20.01 $ 13.26
Granted (in USD per share) 7.64 14.26
Vested (in USD per share) 21.79 15.97
Canceled forfeited (in USD per share) 20.06 12.66
Ending balance (in USD per share) $ 13.26 $ 12.86