Stockholders' Equity (Stock Option Activity) (Details) - Options	1 Months Ended	12 Months Ended
	Jan. 31, 2015 USD ($) $ / shares shares	Jan. 31, 2017 USD ($) $ / shares item shares	Jan. 31, 2016 USD ($) $ / shares shares	Jan. 31, 2015 $ / shares shares
Number of Shares
Unvested time-based stock options outstanding		298,298	596,598
Outstanding, beginning of period		894,899	894,899
Granted
Exercised
Canceled
Outstanding, end of period	894,899	894,899	894,899	894,899
Exercisable, end of period		596,601	298,301
Weighted Average Exercise Price
Outstanding, beginning of period | $ / shares		$ 39.08	$ 39.08
Granted | $ / shares
Exercised | $ / shares
Canceled | $ / shares
Outstanding, end of period | $ / shares	$ 39.08	39.08	39.08	$ 39.08
Exercisable, end of period | $ / shares		$ 39.08	$ 39.08
Weighted Average Remaining Contractual Life (in years)
Outstanding		7 years 11 months 16 days	8 years 11 months 16 days	9 years 11 months 16 days
Exercisable, end of period		7 years 11 months 16 days	8 years 11 months 16 days
Aggregate Intrinsic Value
Outstanding | $		$ 8,868,400	$ 205,800
Exercisable, end of period | $		$ 5,912,300
Vesting period		3 years
Vesting installments | item		3
Expiration period		10 years
Share based compensation | $	$ 200,000	$ 3,900,000
Unrecognized stock-based compensation related to options | $		$ 7,700,000	$ 7,500,000
Compensation costs not yet recognized, weighted-average period of recognition		10 months 13 days	1 year 10 months 13 days