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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation maximum authorized share under the optionplan     11,370,068 6,337,779
Option Vesting period     4 years  
Option expiration period     10 years  
Unvested shares of options granted with double trigger vesting acceleration percentage in event of sale     50.00%  
Total intrinsic value of options exercised     $ 3,800 $ 700
Weighted-average grant date fair value of options granted     $ 4.24 $ 2.02
Unamortized stock-based compensation expense $ 26,900   $ 18,500  
Weighted-average period over which unrecognized compensation cost is expected to be recognized 3 years   3 years 4 months 24 days  
Options exercised $ 1,746 $ 1,316 $ 1,702 $ 693
Incentive Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price of incentive stock options granted under the Option Plans     100.00%  
Nonstatutory Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price of incentive stock options granted under the Option Plans     85.00%