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Stockholders' Equity (Deficit) - Warrant Transactions (Details Textual) - USD ($)			6 Months Ended	12 Months Ended
	Aug. 14, 2015	Jan. 22, 2015	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Jul. 20, 2015	Jan. 30, 2015	Feb. 02, 2014	Sep. 23, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of warrant or right, number of securities called by each warrant or right			12,500				5,000
Class of warrant or right, exercise price of warrants or rights (per share)			$ 10.20				$ 10.20
Proceeds from issuance of warrants (in dollars)		$ 100
Fair value of warrants issued (in dollars)		$ 7,700	$ 44,250	$ 51,950
Percentage of warrants held by investors to participate in warrant exercise offer (percentage)						70.00%
Number of shares available to be repurchased at end of exercise price offer period (shares)	2,191,547			523,115
Proceeds from warrant exercises (dollars)	$ 12,861,057
Class of warrant or right, average exercise price of warrants or rights (per share)	$ 5.87			$ 9.15
Loss on exchange of warrants				$ 1,845,810	$ 0
Fair Value Adjustment of Warrants				(7,178,035)
General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Adjustments to additional paid in capital, share-based compensation, requisite service period recognition (in dollars)				7,600
2013 Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of warrant or right, discount on exercise price of warrants or rights (percentage)	25.00%					25.00%
Exercise of warrants (shares)	798,715
Proceeds from warrant exercises (dollars)	$ 4,100,252
Loss on exchange of warrants	$ 647,989
2014 Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of warrant or right, discount on exercise price of warrants or rights (percentage)	26.00%					26.00%
Proceeds from warrant exercises (dollars)	$ 8,760,805
Series A five-year warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of warrant or right, exercise price of warrants or rights (per share)								$ 7.00	$ 5.00
Series B five-year warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of warrant or right, exercise price of warrants or rights (per share)								$ 10.00
Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Loss on exchange of warrants				$ 1,197,821
Fair value of remaining unexercised warrants	$ 1,181,638
Remaining unexercised warrants, shares	396,536
Warrant [Member] | 2014 Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise of warrants (shares)	1,392,832
Fair value of warrants exercised	$ 5,348,408
2013 Activity [Member] | Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of warrant or right, exercise price of warrants or rights (per share)									$ 10.00

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