Stock-Based Compensation - Schedule of Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019	Jan. 31, 2020
Schedule of stock options activity
Outstanding Option Beginning Balance	561,110		561,110
Stock options granted	0	0	200,000	0
Exercised			0
Cancelled			0
Outstanding Option Ending Balance			761,110		561,110
Exercisable			561,110		399,905
Expected to vest			167,769
Weighted Average Exercise Price per Option, Beginning Balance	$ 28.41		$ 28.41
Granted, Weighted Average Exercise Price per Option			12.42
Exercised. Weighted Average Exercise Price per Option			0
Cancelled, Weighted Average Exercise Price per Option			0
Weighted Average Exercise Price per Option, Ending Balance			24.21		$ 28.41
Exercisable, Weighted Average Exercise Price per Option			28.41
Expected to vest, Weighted Average Exercise Price per Option			12.42
Option Price Per Share, Granted			12.42
Option Price Per Share, Exercised			$ 0
Options outstanding, Weighted Average Remaining Contractual Term (years)			6 years 1 month 6 days		5 years 2 months 12 days
Exercisable, Weighted Average Remaining Contractual Term (years)			4 years 8 months 12 days
Expected to vest, Weighted Average Remaining Contractual Term (years)			9 years 10 months 24 days
Options outstanding, Aggregate Intrinsic Value			$ 0		$ 0
Exercisable, Aggregate Intrinsic Value	$ 0
Expected to vest, Aggregate Intrinsic Value			$ 0
Minimum
Schedule of stock options activity
Option Price Per Share, Beginning Balance	$ 23.35		$ 23.35
Option Price Per Share, Ending Balance			12.42		$ 23.35
Maximum
Schedule of stock options activity
Option Price Per Share, Beginning Balance	$ 42.12		42.12
Option Price Per Share, Ending Balance			$ 42.12		$ 42.12