Summary of Significant Accounting Policies - Narrative (Details) - USD ($)	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Feb. 01, 2018	Jan. 31, 2018
Class of Stock [Line Items]
Deferred professional costs	$ 406,000			$ 471,000
Accumulated amortization of deferred costs	414,000			312,000
Amortization of deferred costs	102,000	$ 83,000
Revenue recognized	3,924,000
Severance expenses	13,000	55,000
Accrued severances	12,000			0
Share-based compensation expense	222,458	267,174
Cost of shares for tax withholding	46,904	$ 28,927
Reserves for uncertain tax positions and corresponding interest and penalties	$ 300,000			$ 286,000
ASU 2014-09 | Retained Earnings
Class of Stock [Line Items]
Cumulative effect of new accounting principle in period of adoption			$ 1,400,000
Restricted Stock
Class of Stock [Line Items]
Antidilutive securities (in shares)	661,587	316,158
Stock Option
Class of Stock [Line Items]
Antidilutive securities (in shares)	2,178,822	2,292,187
Warrant
Class of Stock [Line Items]
Antidilutive securities (in shares)		1,400,000
Series A Preferred Stock
Class of Stock [Line Items]
Convertible redeemable preferred stock, shares outstanding (in shares)	2,895,464			2,949,995
Number of common shares for each convertible preferred share (in shares)	1
Restricted Stock
Class of Stock [Line Items]
Shares surrendered for tax withholding (in shares)	26,062
Cost of shares for tax withholding	$ 47,000
Minimum | Restricted Stock
Class of Stock [Line Items]
Service period (in years)	1 year
Maximum | Restricted Stock
Class of Stock [Line Items]
Service period (in years)	4 years