Private Placement Investment - Common Stock Warrants Narrative (Details) - USD ($)	Oct. 19, 2012	Aug. 16, 2012	Jan. 31, 2018	Jan. 31, 2017	Oct. 31, 2012
Class of Stock [Line Items]
Warrants exercisable (in shares)		1,200,000
Weighted average exercise price (in USD per share)		$ 3.99
Net of transaction costs, allocated to the warrants		$ 1,425,000
Common Stock Warrant
Class of Stock [Line Items]
Warrants exercisable (in shares)			1,400,000
Weighted average exercise price (in USD per share)			$ 4.00
Private Placement | Common Stock Warrant
Class of Stock [Line Items]
Warrants exercisable (in shares)		1,200,000
Weighted average exercise price (in USD per share)		$ 3.99
Fair value of warrants		$ 2,856,000
Annual volatility		75.00%
Risk-free rate		0.90%
Dividend yield		0.00%
Expected life		5 years
Placement Agent | Common Stock Warrant
Class of Stock [Line Items]
Warrants exercisable (in shares)	200,000
Weighted average exercise price (in USD per share)	$ 4.06
Fair value of warrants	$ 754,000
Annual volatility	75.00%
Risk-free rate	0.90%
Dividend yield	0.00%
Expected life	5 years
Estimate of Fair Value | Private Placement | Common Stock Warrant
Class of Stock [Line Items]
Derivative liability			$ 0	$ 46,000
Estimate of Fair Value | Placement Agent | Common Stock Warrant
Class of Stock [Line Items]
Derivative liability					$ 4,139,000