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Summary of Significant Accounting Policies - Stock-based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock awards granted (in shares) 101,774 134,259 893,023 137,688
Aggregate grant date fair value $ 750 $ 2,774 $ 7,957 $ 2,845
Dividend yield     0.00%  
Stock-based compensation expense $ 2,300 $ 3,400 $ 4,683 $ 6,636
(RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSUs and PSUs (in shares) 101,774 100,365 622,195 103,794
(RSUs) [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
(RSUs) [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     4 years  
Phantom Share Units (PSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSUs and PSUs (in shares) 0 33,894 270,828 33,894
Expected volatility rate     60.00%  
Expected term     3 years  
Risk free interest rate     1.42%