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Stock-Based Compensation - Schedule of Information Related to Stock Option Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Total fair value of stock options exercised $ 1,912 $ 454 $ 212
Total fair value of stock options vested $ 803 $ 1,275 $ 2,021