STOCKHOLDERS' EQUITY (Details Textual) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Stockholders Equity [Line Items]
Preferred stock, shares authorized	10,000,000	10,000,000	10,000,000
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition		2 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total	$ 18,900,000	$ 18,900,000
Shares available from Shelf Registration Statement		$ 248,000,000
Common Stock, Shares Authorized	150,000,000	150,000,000	150,000,000
Available-for-sale Securities, Equity Securities			$ 250,000,000
Restricted Stock Or Unit Expense	$ 1,240,034	$ 12,840,048
ATM [Member]
Stockholders Equity [Line Items]
Common Stock Value Reserved for Future Issuance		$ 75,000,000
Commission Percentage	3.00%	3.00%
Common Stock [Member]
Stockholders Equity [Line Items]
Proceeds From Issuance Of Common Stock		$ 68,200,000
Sale of Stock, Price Per Share	$ 16.66	$ 16.66
Proceeds from Issuance of Common Stock, Net		$ 67,000,000
Stock Issued During Period Shares Market Public Offering		4,094,498
Corporate Milestone [Member]
Stockholders Equity [Line Items]
Restricted Stock, Outstanding, Number, Ending Balance	1,866,167	1,866,167
Restricted Stock [Member]
Stockholders Equity [Line Items]
Restricted Stock Or Unit Expense		$ 12,800,000
Incentive Plan 2012
Stockholders Equity [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	6,000,000	6,000,000
Equity Incentive Plans [Member]
Stockholders Equity [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	5,676,574	5,676,574