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Derivative Financial Instruments - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2017	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				21,701	108,507		150,000
Shares available for issuance upon exercise				36,169	36,169
Face amount of new loans				$ 8,000,000
Senior Convertible Notes [Member]
Derivative [Line Items]
Warrants exercisable date	Apr. 13, 2014
Warrants Attached to Series G Preferred Stock [Member]
Derivative [Line Items]
Warrants issued to acquire common shares						43,750
Warrants exercisable date	Apr. 13, 2014
Warrants Attached to Senior Convertible Debt [Member]
Derivative [Line Items]
Warrants issued to acquire common shares					108,507
Common Stock [Member] | Senior Convertible Notes [Member]
Derivative [Line Items]
Linked common shares		130,208
Common Stock [Member] | Level 3 [Member]
Derivative [Line Items]
Linked common shares			143,750
Warrants exercisable date	Oct. 11, 2013
Common Stock [Member] | Warrants Attached to Series G Preferred Stock [Member]
Derivative [Line Items]
Linked common shares		43,750

X

- Definition

Class of warrant or right title of security warrants or rights exercised.

+ References

No definition available.

+ Details

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X

- Definition

Class of warrant or right title of security warrants or rights expired.

+ References

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+ Details

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X

- Definition

Class Of Warrant Or Right, Warrants Issued

+ References

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X

- Definition

Number of securities called by warrants or rights upon additional financing.

+ References

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+ Details

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X

- 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

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X

- 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=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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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