Expiration date of warrants held.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column A

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
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+ 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 (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Fair Value Measurements (Narrative) (Details) - USD ($)	3 Months Ended
Fair Value Measurements (Narrative) (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents
Financial assets
Financial liabilities	$ 16,657,699	19,787,007
Quoted Prices In Active Markets For Identical Instruments (Level 1) [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents
Financial assets
Financial liabilities
Significant Other Observable Inputs (Level 2) [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents
Financial assets
Financial liabilities
Significant Unobservable Inputs (Level 3) [Member] \| Warrants Issued September 2016 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant expiration date	Sep. 01, 2021
Significant Unobservable Inputs (Level 3) [Member] \| Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents
Financial assets
Financial liabilities	$ 16,657,699	$ 19,787,007
Significant Unobservable Inputs (Level 3) [Member] \| Recurring [Member] \| Warrants Issued May 2012 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant expiration date	May 01, 2018
Volatility rate	96.06%
Risk-free interest rate	1.03%
Closing stock price	$ 0.57
Significant Unobservable Inputs (Level 3) [Member] \| Recurring [Member] \| Warrants Issued August 2013 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant expiration date	Nov. 01, 2018
Volatility rate	113.29%
Risk-free interest rate	1.28%
Closing stock price	$ 0.57
Significant Unobservable Inputs (Level 3) [Member] \| Recurring [Member] \| Warrants Issued September 2016 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Volatility rate	120.29%
Risk-free interest rate	1.96%
Closing stock price	$ 0.57