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Marketable Securities and Fair Value Measurements - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Common stock warrants	$ 360,795	$ 1,167,614
Change in the fair value	$ (807,000)	$ (134,000)	$ (722,000)
Number of warrants exercised (shares)	0	0
First warrant
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Change in the fair value	$ 0	$ (6,000)	$ (544,000)
Significant Unobservable Inputs (Level 3)
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Change in the fair value	$ (806,819)	(133,524)
Significant Unobservable Inputs (Level 3) | Second warrant
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Common stock warrants		$ 0

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- Definition

Class of Warrant or Right, Number of Warrants Exercised

+ References

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- Definition

Marketable securities and fair value measurements.

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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

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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

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