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Net Loss Per Share Attributable to Common Stockholders - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2021
Apr. 30, 2021
Jul. 31, 2020
Apr. 30, 2020
Jul. 31, 2021
Jul. 31, 2020
Jan. 31, 2021
Earnings Per Share [Abstract]              
Net loss attributable to common stockholders $ (27,592) $ (17,631) $ (25,116) $ (29,224) $ (45,223) $ (54,340) $ (94,692)
Weighted-average common shares outstanding, basic (in shares) 126,906,937   118,411,758   126,152,602 117,519,214  
Weighted-average common shares outstanding, diluted (in shares) 126,906,937   118,411,758   126,152,602 117,519,214  
Net loss per share attributable to common stockholders, basic (in dollars per share) $ (0.22)   $ (0.21)   $ (0.36) $ (0.46)  
Net loss per share attributable to common stockholders, diluted (in dollars per share) $ (0.22)   $ (0.21)   $ (0.36) $ (0.46)