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Stock-Based Compensation - Schedule of Non-vested Stock Options (Details)
 12 Months Ended
Jan. 31, 2019
$ / shares
shares
Non-vested stock options:  
Non-vested, Shares, Beginning Balance | shares 367,246
Vested, Shares | shares (65,230)
Non-vested, Shares, Ending Balance | shares 302,016
Non-vested stock options:  
Non-vested, Weight Average Grant Date Fair Value, Beginning Balance | $ / shares $ 10.62
Vested, Weight Average Grant Date Fair Value | $ / shares 12.31
Non-vested, Weight Average Grant Date Fair Value, Ending Balance | $ / shares $ 10.25