Stock-Based Compensation - Summary of Stock Option Activity (Details)	12 Months Ended
	Jan. 31, 2018 USD ($) $ / shares shares
Options
Outstanding - beginning of year (in shares) | shares	2,100,480
Granted (in shares) | shares	265,000
Exercised (in shares) | shares	0
Expired (in shares) | shares	(133,323)
Forfeited (in shares) | shares	(59,001)
Outstanding - end of year (in shares) | shares	2,173,156
Options exercisable (in shares) | shares	1,626,404
Vested or expected to vest - end of year (in shares) | shares	2,102,078
Weighted Average Exercise Price
Outstanding - beginning of year (USD per share) | $ / shares	$ 4.16
Granted (USD per share) | $ / shares	1.17
Exercised (USD per share) | $ / shares	0.00
Expired (USD per share) | $ / shares	4.73
Forfeited (USD per share) | $ / shares	2.24
Outstanding - end of year (USD per share) | $ / shares	3.42
Weighted Average Exercise Price, Exercisable - end of year (USD per share) | $ / shares	3.98
Weighted Average Exercise Price, Vested or expected to vest - end of year (USD per share) | $ / shares	$ 3.47
Remaining Life in Years, Outstanding	7 years 1 month 10 days
Remaining Life in Years, Exercisable	6 years 8 months 1 day
Remaining Life in Years, Vested or expected to vest	7 years 26 days
Aggregate intrinsic value of outstanding options at year end | $	$ 3,868,218
Aggregate intrinsic value of exercisable options at year end | $	2,894,999
Aggregate intrinsic value of options vested or expected to vest at year end | $	$ 3,741,699