Stock-Based Compensation - Summary of Stock Option Activity (Details) - Stock Options	12 Months Ended
	Jan. 31, 2017 USD ($) $ / shares shares
Options
Outstanding - beginning of year (in shares) | shares	2,411,879
Granted (in shares) | shares	416,525
Exercised (in shares) | shares	0
Expired (in shares) | shares	(342,502)
Forfeited (in shares) | shares	(385,422)
Outstanding - end of year (in shares) | shares	2,100,480
Options exercisable (in shares) | shares	1,374,642
Vested or expected to vest - end of year (in shares) | shares	1,942,650
Weighted Average Exercise Price
Outstanding - beginning of year (USD per share) | $ / shares	$ 4.16
Granted (USD per share) | $ / shares	2.02
Exercised (USD per share) | $ / shares	0.00
Expired (USD per share) | $ / shares	4.20
Forfeited (USD per share) | $ / shares	3.67
Outstanding - end of year (USD per share) | $ / shares	3.82
Weighted Average Exercise Price, Exercisable - end of year (USD per share) | $ / shares	4.55
Weighted Average Exercise Price, Vested or expected to vest - end of year (USD per share) | $ / shares	$ 3.93
Remaining Life in Years, Outstanding	7 years 8 months 19 days
Remaining Life in Years, Exercisable	7 years 2 months 12 days
Remaining Life in Years, Vested or expected to vest	7 years 7 months 21 days
Aggregate intrinsic value of outstanding options at year end | $	$ 3,087,706
Aggregate intrinsic value of exercisable options at year end | $	2,020,724
Aggregate intrinsic value of options vested or expected to vest at year end | $	$ 2,855,695