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Derivative Financial Instruments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	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
Linked common shares	130,208	130,208
Shares available for issuance upon exercise					36,169	36,169
Additional Financing [Member]
Derivative [Line Items]
Face amount of new loans					$ 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
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

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+ 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

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+ 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=64930739&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=64930785&loc=d3e28551-108399

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