STOCKHOLDERS' EQUITY (Details Narrative) - USD ($)							3 Months Ended		6 Months Ended
	Jan. 12, 2016	Jan. 06, 2016	Jul. 15, 2015	Jul. 09, 2015	Feb. 17, 2015	Feb. 10, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Preferred stock, par value (in dollars per share)							$ 0.001		$ 0.001		$ 0.001
Preferred stock, shares authorized							10,000,000		10,000,000		10,000,000
Preferred stock, shares issued							0		0		0
Preferred stock, shares outstanding							0		0		0
Common stock, shares authorized							350,000,000		350,000,000		350,000,000
Common stock, shares issued							196,492,195		196,492,195		177,928,041
Common stock, shares outstanding							196,492,195		196,492,195		177,928,041
2009 Long-term Incentive Plan [Member]
Weighted average grant date fair value							$ 5.08		$ 5.08
Number of shares authorized for issuance							25,000,000		25,000,000
Options outstanding, ending							17,800,183		17,800,183
Number of shares available for issuance							3,247,352		3,247,352
2012 Stock Incentive Plan [Member]
Number of shares authorized for issuance							10,000,000		10,000,000
Options outstanding, ending							2,868,474		2,868,474
Number of shares available for issuance							7,050,000		7,050,000
Stock Options [Member]
Number of common stock issued during period for stock options exercised									417,168
Exercise price of options							$ 3.38		$ 3.38		$ 3.28
Weighted average grant date fair value								$ 3.49		$ 3.49
Exercise price - lower									.10
Exercise price - upper									$ 8.92
Sharebased compensation - stock options							$ 4,160,071	$ 1,973,675	$ 8,311,330	$ 2,702,102
Unrecognized estimated compensation expense							$ 13,321,000		$ 13,321,000
Recognized period for recognition - stock option compensation									1 year 10 months 24 days
Options outstanding, ending							20,668,657		20,668,657		20,725,325
Options exercised [Member]
Number of common stock issued during period for stock options exercised							77,123	366,617	417,168	377,867
Value of common stock issued during period for stock options exercised							$ 191,592	$ 484,143	$ 978,042	$ 491,351
Underwriting Agreement - Goldman And Cowen [Member]
Number of shares issued during the period	17,242,242	15,151,515
Share price (in dollars per share)		$ 8.25
Common stock issued during the period		$ 134,900,000
Additional common stock issued under offering		2,272,727
Number of days of the option to purchase shares		30 days
Stifel Underwriters [Member]
Number of shares issued during the period			4,423,077	3,846,154
Share price (in dollars per share)				$ 7.80
Common stock issued during the period				$ 32,200,000
Additional common stock issued under offering				576,923
Number of days of the option to purchase shares				30 days
Cowen and Company, LLC (Underwriters) [Member]
Number of shares issued during the period					15,617,282	13,580,246
Share price (in dollars per share)						$ 4.05
Common stock issued during the period						$ 59,100,000
Additional common stock issued under offering						2,037,036
Number of days of the option to purchase shares						30 days