STOCK-BASED COMPENSATION (Details 2) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended					3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		6 Months Ended	3 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 RSUs	Jun. 30, 2013 RSUs Employee Performance-contingent Senior management	Jun. 30, 2012 RSUs Employee Performance-contingent Senior management	Jun. 30, 2013 RSUs Employee Performance-contingent Senior management	Jun. 30, 2012 RSUs Employee Performance-contingent Senior management	Dec. 31, 2010 RSUs Employee Performance-contingent Senior management	Jun. 30, 2013 RSAs	Jun. 30, 2013 Stock options	Jun. 30, 2013 Research and development	Jun. 30, 2012 Research and development	Jun. 30, 2013 Research and development	Jun. 30, 2012 Research and development	Jun. 30, 2013 General and administrative	Jun. 30, 2012 General and administrative	Jun. 30, 2013 General and administrative	Jun. 30, 2012 General and administrative	Jun. 30, 2013 2013 Restricted Stock Awards Plan RSAs Employee Performance-contingent Senior management	Jun. 30, 2013 2012 Restricted Stock Awards Plan RSAs Employee Performance-contingent Senior management	Jun. 30, 2013 2012 Restricted Stock Awards Plan RSAs Employee Performance-contingent Senior management	Dec. 31, 2012 2012 Restricted Stock Awards Plan RSAs Employee Performance-contingent Senior management	Jun. 30, 2013 2011 Restricted Stock Awards Plan RSAs Performance-contingent Maximum	Jun. 30, 2013 2011 Restricted Stock Awards Plan RSAs Performance-contingent Non-executive officer	Dec. 31, 2011 2011 Restricted Stock Awards Plan RSAs Performance-contingent Non-executive officer	Jun. 30, 2013 2011 Restricted Stock Awards Plan RSAs Employee Performance-contingent Senior management	Dec. 31, 2011 2011 Restricted Stock Awards Plan RSAs Employee Performance-contingent Senior management	Dec. 31, 2011 2011 Restricted Stock Awards Plan Research and development RSAs Employee Performance-contingent Senior management	Dec. 31, 2011 2011 Restricted Stock Awards Plan General and administrative RSAs Employee Performance-contingent Senior management
Allocation of stock-based compensation expense
Shares of common stock approved and authorized for issuance										210,000											44,500			44,500			25,000		1,290,000
Stock-based compensation expense	$ 7,162,000	$ 5,979,000	$ 13,257,000	$ 12,214,000		$ 32,000	$ 80,000	$ 72,000	$ 177,000				$ 4,508,000	$ 3,541,000	$ 8,305,000	$ 7,070,000	$ 2,654,000	$ 2,438,000	$ 4,952,000	$ 5,144,000	$ 217,000	$ 59,000	$ 146,000			$ 367,000		$ 0
Stock-based compensation expenses that will be recognized subject to sufficient performance conditions																									7,600,000
Total stock-based compensation expense capitalized to inventory	28,000	0	170,000	0
Timeframe for achievement of performance conditions																													6 years
Maximum potential expense associated with incentive compensation program																											475,000		31,900,000	6,300,000	25,600,000
Information related to share-based compensation
Total unrecognized compensation cost related to unvested stock-based compensation					$ 20,400,000						$ 28,900,000	$ 6,900,000