Stock-Based Compensation - Summary of Stock Option Activity (Details)	12 Months Ended
	Jan. 31, 2019 USD ($) $ / shares shares
Options
Outstanding - beginning of year (in shares) | shares	2,173,156
Granted (in shares) | shares	47,000
Exercised (in shares) | shares	(50,694)
Expired (in shares) | shares	(201,469)
Forfeited (in shares) | shares	(387,336)
Outstanding - end of year (in shares) | shares	1,580,657
Options exercisable (in shares) | shares	1,401,435
Vested or expected to vest - end of year (in shares) | shares	1,542,516
Weighted Average Exercise Price
Outstanding - beginning of year (USD per share) | $ / shares	$ 3.42
Granted (USD per share) | $ / shares	1.68
Exercised (USD per share) | $ / shares	1.18
Expired (USD per share) | $ / shares	2.55
Forfeited (USD per share) | $ / shares	3.61
Outstanding - end of year (USD per share) | $ / shares	3.50
Weighted Average Exercise Price, Exercisable - end of year (USD per share) | $ / shares	3.73
Weighted Average Exercise Price, Vested or expected to vest - end of year (USD per share) | $ / shares	$ 3.54
Remaining Life in Years, Outstanding	6 years 1 month 17 days
Remaining Life in Years, Exercisable	5 years 10 months 28 days
Remaining Life in Years, Vested or expected to vest	6 years 1 month 2 days
Aggregate intrinsic value of outstanding options at year end | $	$ 15,000
Aggregate intrinsic value of exercisable options at year end | $	8,000
Aggregate intrinsic value of options vested or expected to vest at year end | $	$ 14,000