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Fair Value Measurements (Details 3) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes in fair value of the financial liabilities
Decrease in fair value included in change in fair value of common stock warrants	$ (722,000)	$ (516,000)	$ 46,100,000
Change in classification from liability to stockholders' equity due to warrant exercises		(17,002,211)	(35,370,529)
Significant Unobservable Inputs (Level 3)
Changes in fair value of the financial liabilities
Balance at beginning of year	2,022,729	19,540,583
Decrease in fair value included in change in fair value of common stock warrants	(721,591)	(515,643)
Change in classification from liability to stockholders' equity due to warrant exercises	0	(17,002,211)
Balance at end of year	$ 1,301,138	$ 2,022,729	$ 19,540,583

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- Definition

Change in Classification of Warrants from Liability to Equity Due to Exercise

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ 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 (c)(1)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ 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 (c)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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