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Derivative Financial Instruments - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015 | Apr. 13, 2014 | Oct. 11, 2013 | May. 10, 2012 | Nov. 08, 2011 | Apr. 08, 2011 | Oct. 11, 2010
Derivative [Line Items] |  |  |  |  |  |  |  |
Warrants issued to acquire common shares |  |  |  |  | 260,417 | 108,507 |  | 150,000
Warrants exercisable date | Apr. 13, 2014 |  |  |  |  |  |  |
Warrants linked to common stock, outstanding | 0 | 0 |  |  |  |  |  |
Shares available for issuance upon exercise |  |  |  |  | 36,169 | 36,169 |  |
Additional financing |  |  |  |  | $ 8,000,000 |  |  |
Warrants Attached to Series G Preferred Stock [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Warrants issued to acquire common shares |  |  |  |  |  |  | 43,750 |
Warrants Attached to Senior Convertible Debt [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Warrants issued to acquire common shares |  |  |  |  |  | 108,507 |  |
Warrants linked to common stock, outstanding | 130,208 |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Linked common shares |  |  | 525,000 |  |  |  |  |
Common Stock [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Linked common shares |  |  |  | 1,725,000 |  |  |  |
Warrants exercisable date |  | Oct. 11, 2013 |  |  |  |  |  |

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- Definition Class Of Warrant Or Right, Warrants Issued + References No definition available. + Details
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- Definition Derivative financial instruments fair value assumptions linked common shares. + References No definition available. + Details
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- Definition Number of securities called by warrants or rights upon additional financing. + References No definition available. + Details
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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 + Details
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- Definition Number of warrants or rights outstanding. + 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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