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Derivative Financial Instruments - Additional Information (Detail) (USD $) | 3 Months Ended |  |  |  | 3 Months Ended |  | 3 Months Ended |  | 0 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | May 10, 2012 | Nov. 08, 2011 | Oct. 11, 2011 | Mar. 31, 2014 Warrants Attached to Series G Preferred Stock [Member] | Apr. 08, 2011 Warrants Attached to Series G Preferred Stock [Member] | Mar. 31, 2014 Warrants Attached to Senior Convertible Debt [Member] | Nov. 08, 2011 Warrants Attached to Senior Convertible Debt [Member] | Oct. 11, 2011 Common Stock [Member] | Mar. 31, 2014 Common Stock [Member] | Dec. 31, 2013 Common Stock [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Warrants issued to acquire common shares |  |  |  | 1,800,000 |  | 525,000 |  | 1,302,083 |  |  |
Warrants linked to common stock, exercised |  |  |  |  |  |  |  |  | 1,725,000 |  |
Warrants linked to common stock, outstanding | 2,087,500 |  |  |  | 525,000 |  | 1,562,500 |  |  | 0 | 0
Warrants expiration date | Oct. 11, 2013 |  |  |  | Apr. 13, 2014 |  | Nov. 09, 2016 |  |  |  |
Shares available for issuance upon exercise |  | 434,027 | 434,027 |  |  |  |  |  |  |  |
Original principal amount |  | $ 8,000,000 |  |  |  |  |  |  |  |  |
Issued warrants to acquire common shares |  | 260,417 |  |  |  |  |  |  |  |  |

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- Definition Date the warrants or rights are exercisable, in CCYY-MM-DD format. + References 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)(3)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 3 -Article 4 + Details
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