Income Taxes - Narrative (Details) - USD ($)	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Feb. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax provision	$ 248,000	$ 81,000
Loss before income taxes	$ 28,653,000	$ 22,672,000
Effective income tax rate	(0.90%)	(0.40%)
Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase of deferred tax assets			$ 300,000
Increase of deferred tax asset valuation allowance			300,000
Retained Earnings | Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative impact adjustment			$ 0