STOCKHOLDERS' EQUITY (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stockholders' Equity
Common stock issued (in shares)		21,613,483	12,075,000
Net proceeds from sale of common stock		$ 295,697,000	$ 83,784,000
Net proceeds from sale of stock in an underwritten public offering		278,563,000	43,483,000
Preferred stock, shares authorized	3,000,000	3,000,000
Shares common stock issued in connection with supply agreement	89,592,779	89,246,832
Shares Issued in Connection with Supply Agreement	2,000,000
Research and Development expense	104,381,000	67,401,000	47,398,000
Other assets	1,722,000	148,000
Biosyn Corporation
Stockholders' Equity
Shares common stock issued in connection with supply agreement	152,172
Shares Issued in Connection with Supply Agreement	2,000,000
Research and Development expense	2,000,000
Prepaid assets	300,000
Other assets	1,600,000
Class C Preferred Stock
Stockholders' Equity
Preferred stock, shares authorized	3,000,000
Series C-1 Preferred Stock
Stockholders' Equity
Preferred stock, shares authorized	350,000
Cantor Amendment
Stockholders' Equity
Common stock issued (in shares)		2,433,608	8,003,290
Net proceeds from sale of common stock		$ 17,100,000	$ 40,100,000