Aggregate amount of each class of warrants or rights outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: 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))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Article 4

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

Warrants - Additional Information (Detail) (USD $)	1 Months Ended			1 Months Ended
Warrants - Additional Information (Detail) (USD $)	Jan. 31, 2013 Investor warrants	Nov. 30, 2012 Investor warrants	May 15, 2012 Investor warrants	Jan. 31, 2013 Lender Warrant	May 15, 2012 Lender Warrant	May 23, 2005 Lender Warrant Redeemable Preferred Stock, Series C
Class of Warrant or Right [Line Items]
Warrants for purchase of shares of common stock						423,529
Warrants, exercise price				8.50	8.50	4.25
Warrants which became exercisable			4,366,803		211,764
Warrants, net exercised	350,705	472,736		117,166
Common shares issued exercise price per share	$ 4.58	$ 4.58