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Marketable Securities and Fair Value Measurements (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2011 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Jul. 01, 2015 | Mar. 31, 2012
Marketable Securities and Fair Value Measurements (Textual) [Abstract] |  |  |  |  |  |  |  |
Carryover basis |  |  |  |  |  |  | $ 0 |
Common stock warrants |  | $ 1,363,637 |  | $ 1,363,637 |  | $ 1,167,614 |  |
Increase/decrease in fair value included in change in fair value of common stock warrants |  | $ 313,000 | $ 108,000 | $ 196,000 | $ 514,000 |  |  |
Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |  |  |  |
Marketable Securities and Fair Value Measurements (Textual) [Abstract] |  |  |  |  |  |  |  |
Number of shares held in an affiliated entity (shares) |  | 1,644,155 |  | 1,644,155 |  | 1,644,155 |  |
Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
Marketable Securities and Fair Value Measurements (Textual) [Abstract] |  |  |  |  |  |  |  |
Investment owned (shares) |  | 395,758 |  | 395,758 |  |  |  |
Using Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |  |  |  |
Marketable Securities and Fair Value Measurements (Textual) [Abstract] |  |  |  |  |  |  |  |
Increase/decrease in fair value included in change in fair value of common stock warrants |  |  |  | $ 196,023 |  |  |  |
Using Significant Unobservable Inputs (Level 3) [Member] | Second warrant [Member] |  |  |  |  |  |  |  |
Marketable Securities and Fair Value Measurements (Textual) [Abstract] |  |  |  |  |  |  |  |
Common stock purchase warrant (in shares) |  |  |  |  |  |  |  | 150,000
Using Significant Unobservable Inputs (Level 3) [Member] | First warrant [Member] |  |  |  |  |  |  |  |
Marketable Securities and Fair Value Measurements (Textual) [Abstract] |  |  |  |  |  |  |  |
Common stock purchase warrant (in shares) | 50,000 |  |  |  |  |  |  |
Exercise price of a five-year warrant ($ per share) | $ 24.00 |  |  |  |  |  |  |

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- Definition Marketable securities and fair value measurements. + References No definition available. + Details
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- Definition Exercise price of the warrants. + References 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 + Details
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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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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=66048111&loc=d3e19207-110258 + Details
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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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