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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Treasury Stock
Beginning of period (in shares) at Jan. 31, 2019   102,173,000        
Beginning of period at Jan. 31, 2019 $ 84,549 $ 109 $ 398,882 $ (1,428) $ (301,109) $ (11,905)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Common stock offering, net of issuance costs of $530 (in shares)   7,000,000        
Common stock offering, net of issuance costs of $530 146,470 $ 7 146,463      
Exercise of stock options (in shares)   3,308,000        
Exercise of stock options 14,855 $ 3 14,852      
Vested restricted stock units converted to common shares (in shares)   2,946,000        
Vested restricted stock units converted to common shares 0 $ 3 (3)      
Issuance of restricted stock (in shares)   11,000        
Issuance of restricted stock 0          
Issuance of common stock under employee stock purchase plan (in shares)   392,000        
Issuance of common stock under employee stock purchase plan 6,627   6,627      
Stock-based compensation 69,187   69,187      
Other comprehensive income 1,068     1,068    
Net loss (121,544)       (121,544)  
End of period (in shares) at Jan. 31, 2020   115,830,000        
End of period at Jan. 31, 2020 201,212 $ 122 636,008 (360) (422,653) (11,905)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance costs     530      
Exercise of stock options (in shares)   3,064,000        
Exercise of stock options 16,516 $ 3 16,513      
Vested restricted stock units converted to common shares (in shares)   4,358,000        
Vested restricted stock units converted to common shares 0 $ 4 (4)      
Issuance of restricted stock (in shares)   38,000        
Issuance of restricted stock 0          
Issuance of common stock under employee stock purchase plan (in shares)   699,000        
Issuance of common stock under employee stock purchase plan 7,000 $ 1 6,999      
Stock-based compensation 74,417   74,417      
Other comprehensive income 2,782     2,782    
Net loss (94,692)       (94,692)  
End of period (in shares) at Jan. 31, 2021   123,989,000        
End of period at Jan. 31, 2021 $ 207,235 $ 130 733,933 2,422 (517,345) (11,905)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares) 2,220,276 2,220,000        
Exercise of stock options $ 19,197 $ 2 19,195      
Vested restricted stock units converted to common shares (in shares)   4,402,000        
Vested restricted stock units converted to common shares 0 $ 4 (4)      
Issuance of restricted stock (in shares)   15,000        
Issuance of restricted stock 0          
Issuance of common stock under employee stock purchase plan (in shares)   531,000        
Issuance of common stock under employee stock purchase plan 6,485 $ 1 6,484      
Stock-based compensation 74,821   74,821      
Other comprehensive income (2,609)     (2,609)    
Net loss (93,259)       (93,259)  
End of period (in shares) at Jan. 31, 2022   131,157,000        
End of period at Jan. 31, 2022 $ 211,870 $ 137 $ 834,429 $ (187) $ (610,604) $ (11,905)