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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Treasury Stock
Beginning of period (in shares) at Jan. 31, 2020   115,830,000        
Beginning of period at Jan. 31, 2020 $ 201,212 $ 122 $ 636,008 $ (360) $ (422,653) $ (11,905)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares)   391,000        
Exercise of stock options 1,896 $ 1 1,895      
Vested restricted stock units converted to common shares (in shares)   903,000        
Vested restricted stock units converted to common shares 0 $ 1 (1)      
Issuance of restricted stock (in shares)   26,000        
Issuance of restricted stock 0          
Issuance of common stock under employee stock purchase plan (in shares)   374,000        
Issuance of common stock under employee stock purchase plan 3,743   3,743      
Stock-based compensation 17,617   17,617      
Other comprehensive income (loss) (1,333)     (1,333)    
Net loss (29,224)       (29,224)  
End of period (in shares) at Apr. 30, 2020   117,524,000        
End of period at Apr. 30, 2020 193,911 $ 124 659,262 (1,693) (451,877) (11,905)
Beginning of period (in shares) at Jan. 31, 2020   115,830,000        
Beginning of period at Jan. 31, 2020 201,212 $ 122 636,008 (360) (422,653) (11,905)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (76,381)          
End of period (in shares) at Oct. 31, 2020   122,176,000        
End of period at Oct. 31, 2020 200,663 $ 129 711,413 60 (499,034) (11,905)
Beginning of period (in shares) at Jan. 31, 2020   115,830,000        
Beginning of period at Jan. 31, 2020 201,212 $ 122 636,008 (360) (422,653) (11,905)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
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 (loss) 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)
Beginning of period (in shares) at Apr. 30, 2020   117,524,000        
Beginning of period at Apr. 30, 2020 193,911 $ 124 659,262 (1,693) (451,877) (11,905)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares)   935,000        
Exercise of stock options 4,751 $ 1 4,750      
Vested restricted stock units converted to common shares (in shares)   1,041,000        
Vested restricted stock units converted to common shares 0 $ 1 (1)      
Issuance of restricted stock (in shares)   12,000        
Issuance of restricted stock 0          
Stock-based compensation 17,752   17,752      
Other comprehensive income (loss) 2,250     2,250    
Net loss (25,116)       (25,116)  
End of period (in shares) at Jul. 31, 2020   119,512,000        
End of period at Jul. 31, 2020 193,548 $ 126 681,763 557 (476,993) (11,905)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares)   1,148,000        
Exercise of stock options 6,565 $ 1 6,564      
Vested restricted stock units converted to common shares (in shares)   1,191,000        
Vested restricted stock units converted to common shares 0 $ 1 (1)      
Issuance of common stock under employee stock purchase plan (in shares)   325,000        
Issuance of common stock under employee stock purchase plan 3,257 $ 1 3,256      
Stock-based compensation 19,831   19,831      
Other comprehensive income (loss) (497)     (497)    
Net loss (22,041)       (22,041)  
End of period (in shares) at Oct. 31, 2020   122,176,000        
End of period at Oct. 31, 2020 200,663 $ 129 711,413 60 (499,034) (11,905)
Beginning of period (in shares) at Jan. 31, 2021   123,989,000        
Beginning 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)   1,069,000        
Exercise of stock options 12,111 $ 1 12,110      
Vested restricted stock units converted to common shares (in shares)   871,000        
Vested restricted stock units converted to common shares 0 $ 1 (1)      
Issuance of restricted stock (in shares)   4,000        
Issuance of restricted stock 0          
Issuance of common stock under employee stock purchase plan (in shares)   282,000        
Issuance of common stock under employee stock purchase plan 3,817   3,817      
Stock-based compensation 15,288   15,288      
Other comprehensive income (loss) 355     355    
Net loss (17,631)       (17,631)  
End of period (in shares) at Apr. 30, 2021   126,215,000        
End of period at Apr. 30, 2021 221,175 $ 132 765,147 2,777 (534,976) (11,905)
Beginning of period (in shares) at Jan. 31, 2021   123,989,000        
Beginning 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) 1,828,211 1,828,000        
Exercise of stock options $ 17,026 $ 2 17,024      
Vested restricted stock units converted to common shares (in shares)   3,310,000        
Vested restricted stock units converted to common shares 0 $ 3 (3)      
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 55,655   55,655      
Other comprehensive income (loss) (1,239)     (1,239)    
Net loss (70,149)       (70,149)  
End of period (in shares) at Oct. 31, 2021   129,673,000        
End of period at Oct. 31, 2021 215,013 $ 136 813,093 1,183 (587,494) (11,905)
Beginning of period (in shares) at Apr. 30, 2021   126,215,000        
Beginning of period at Apr. 30, 2021 221,175 $ 132 765,147 2,777 (534,976) (11,905)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares)   402,000        
Exercise of stock options 2,274 $ 1 2,273      
Vested restricted stock units converted to common shares (in shares)   1,172,000        
Vested restricted stock units converted to common shares 0 $ 1 (1)      
Issuance of restricted stock (in shares)   11,000        
Issuance of restricted stock 0          
Stock-based compensation 20,730   20,730      
Other comprehensive income (loss) (8)     (8)    
Net loss (27,592)       (27,592)  
End of period (in shares) at Jul. 31, 2021   127,800,000        
End of period at Jul. 31, 2021 216,579 $ 134 788,149 2,769 (562,568) (11,905)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares)   357,000        
Exercise of stock options 2,641 $ 0 2,641      
Vested restricted stock units converted to common shares (in shares)   1,267,000        
Vested restricted stock units converted to common shares 0 $ 1 (1)      
Issuance of restricted stock (in shares)   0        
Issuance of restricted stock 0          
Issuance of common stock under employee stock purchase plan (in shares)   249,000        
Issuance of common stock under employee stock purchase plan 2,668 $ 1 2,667      
Stock-based compensation 19,637   19,637      
Other comprehensive income (loss) (1,586)     (1,586)    
Net loss (24,926)       (24,926)  
End of period (in shares) at Oct. 31, 2021   129,673,000        
End of period at Oct. 31, 2021 $ 215,013 $ 136 $ 813,093 $ 1,183 $ (587,494) $ (11,905)