Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Preferred Stock Warrants - Additional Information (Details) - shares	Jan. 31, 2017	Nov. 01, 2016	Jan. 31, 2016
Class Of Warrant Or Right [Line Items]
Preferred stock warrants outstanding	0
Series D Warrants \| Common Stock
Class Of Warrant Or Right [Line Items]
Exercise of warrants		36,971
Series E Warrant
Class Of Warrant Or Right [Line Items]
Exercise of warrants			160,523