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Fair Value Measurement - Roll Forward for Financial Assets and Liabilities Measured at Fair Value Using Significant Other Observable Inputs (Level 2) (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable debt securities, Beginning Balance	$ 14,339,896
Fair Value Measurement With Unobservable inputs reconciliation recurring basis asset transfers into level 1	(12,475,042)
Financial liabilities change included in earning fair value disclosure	(65,776)
Unrealized gain	425
Financial liabilities change settled in earning fair value disclosure	(100,000)
Marketable debt securities, ending Balance	1,699,503
Fair Value, Measurements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable debt securities, ending Balance	23,927,887
Fair Value, Measurements [Member] | Bond obligation [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable debt securities, Beginning Balance	331,250
Fair Value Measurement With Unobservable inputs reconciliation recurring basis asset transfers into level 1
Financial liabilities change included in earning fair value disclosure
Unrealized gain
Financial liabilities change settled in earning fair value disclosure	(100,000)
Marketable debt securities, ending Balance	231,250
Fair Value, Measurements [Member] | Warrant liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable debt securities, Beginning Balance	107,968
Fair Value Measurement With Unobservable inputs reconciliation recurring basis asset transfers into level 1
Financial liabilities change included in earning fair value disclosure	(65,776)
Unrealized gain
Financial liabilities change settled in earning fair value disclosure
Marketable debt securities, ending Balance	42,192
Fair Value, Measurements [Member] | Marketable securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable debt securities, Beginning Balance	13,900,678
Fair Value Measurement With Unobservable inputs reconciliation recurring basis asset transfers into level 1	(12,475,042)
Financial liabilities change included in earning fair value disclosure
Unrealized gain	425
Financial liabilities change settled in earning fair value disclosure
Marketable debt securities, ending Balance	$ 1,426,061

X

- Definition

Fair Value Measurement With Directly Or Indirectly Observable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Fair Value Measurement With Directly Or Indirectly Observable Inputs Reconciliation Recurring Basis Liability Settlements

+ References

No definition available.

+ Details

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X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

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X

- Definition

Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

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X

- Definition

The increase (decrease), resulting in a gain, in the difference between the fair value and the carrying value, or in the comparative fair values, of securities held at each balance sheet date, that was included in earnings for the period.

+ References

No definition available.

+ Details

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