STOCK OPTION PLANS (Details) (USD $)	3 Months Ended		9 Months Ended											3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended				9 Months Ended
	Sep. 30, 2013	Aug. 31, 2012	Sep. 30, 2013	Aug. 31, 2012	Sep. 30, 2013 $ 0 to $2.00 [Member]	Sep. 30, 2013 $ 2.01 to $3.00 [Member]	Sep. 30, 2013 $ 3.01 to $4.00 [Member]	Sep. 30, 2013 $ 4.01 to $5.00 [Member]	Sep. 30, 2013 $ 5.01 to $6.00 [Member]	Sep. 30, 2013 $ 6.01 to $8.00 [Member]	Sep. 30, 2013 $ 8.01 to $12.00 [Member]	Sep. 30, 2013 $ 12.01 to $15.00 [Member]	Sep. 30, 2013 $ 15.01 to $964.24 [Member]	Sep. 30, 2013 Research and Development Expense [Member]	Aug. 31, 2012 Research and Development Expense [Member]	Sep. 30, 2013 Research and Development Expense [Member]	Aug. 31, 2012 Research and Development Expense [Member]	Sep. 30, 2013 Selling, General and Administrative Expense [Member]	Aug. 31, 2012 Selling, General and Administrative Expense [Member]	Sep. 30, 2013 Selling, General and Administrative Expense [Member]	Aug. 31, 2012 Selling, General and Administrative Expense [Member]	Sep. 30, 2013 Stock Options [Member]	Jun. 30, 2013 Stock Options [Member]	Mar. 31, 2013 Stock Options [Member]	Aug. 31, 2012 Stock Options [Member]	Sep. 30, 2013 2010 Equity Incentive Plan [Member] Age	Sep. 30, 2013 2010 Equity Incentive Plan [Member] Stock Options [Member]
Assumptions of Black-Scholes option pricing model for stock-based compensation expense [Abstract]
Risk-free interest rate (in hundredths)			1.51%																			1.51%			0.68%
Expected life of stock option			5 years																			5 years			5 years
Annual volatility (in hundredths)			67.18%																			67.18%			124.90%
Dividend rate (in hundredths)			0.00%																			0.00%			0.00%
Option shares [Roll Forward]
Outstanding, beginning of period (in shares)																						8,336	7,885	7,791
Granted (in shares)																						317	478	130
Exercised (in shares)	(370,352)		(378,366)																			(370)	0	(8)
Canceled (in shares)																						(53)	(27)	(28)
Outstanding, end of period (in shares)																						8,230	8,336	7,885
Weighted-average exercise price [Roll Forward]
Outstanding, beginning of period (in dollars per share)																						$ 5.76	$ 5.76	$ 5.79
Granted (in dollars per share)																						$ 11.06	$ 6.58	$ 5.39
Exercised (in dollars per share)																						$ 4.07	$ 0	$ 0.85
Canceled (in dollars per share)																						$ 38.14	$ 20.70	$ 13.94
Outstanding, end of period (in dollars per share)																						$ 5.83	$ 5.76	$ 5.76
Exercisable [Roll Forward]
Outstanding, beginning of period (in shares)																						4,525	4,031	3,494
Granted (in shares)																						0	0	0
Exercised (in shares)																						0	0	0
Canceled (in shares)																						0	0	0
Outstanding, end of period (in shares)																						4,653	4,525	4,031
Weighted-average fair value of options granted [Roll Forward]
Outstanding, beginning of period (in dollars per share)																						$ 3.55	$ 3.47	$ 3.48
Granted (in dollars per share)																						$ 5.32	$ 4.01	$ 3.04
Exercised (in dollars per share)																						$ 3.27	$ 0	$ 0.62
Canceled (in dollars per share)																						$ 0	$ 4.73	$ 4.25
Outstanding, end of period (in dollars per share)																						$ 3.71	$ 3.55	$ 3.47
Weighted-average intrinsic values of stock options [Abstract]
Intrinsic values of options outstanding and expected to vest																						$ 80,455,000			$ 4,841,000
Number of options outstanding and expected to vest (in shares)																						8,230,000			6,125,000
Intrinsic values of options exercisable																						48,773,000			4,131,000
Number of options exercisable (in shares)																						4,653,000			2,995,000
Number of shares available for grant (in shares)																											4,100,000
Percentage of accelerated vesting of unvested stock options allowed as per amendments (in hundredths)																										50.00%
Minimum age of employee for extension of termination date																										62
Minimum years of continuous service prior to retirement																										5 years
Minimum number of days of continuous service in case of death or permanent disability																										90 days
Extension of termination date																										18 months
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Employee and consultant stock-based compensation expense	1,823,000	1,293,000	5,420,000	3,642,000										381,000	309,000	1,123,000	819,000	1,442,000	984,000	4,297,000	2,823,000
Options outstanding under stock option plans [Abstract]
Range of exercise prices, minimum (in dollars per share)					$ 0	$ 2.01	$ 3.01	$ 4.01	$ 5.01	$ 6.01	$ 8.01	$ 12.01	$ 15.01
Range of exercise prices, maximum (in dollars per share)					$ 2.00	$ 3.00	$ 4.00	$ 5.00	$ 6.00	$ 8.00	$ 12.00	$ 15.00	$ 964.24
Options outstanding, number of options outstanding and expected to vest (in shares)	8,230,000		8,230,000		71,000	1,229,000	1,685,000	299,000	3,979,000	662,000	225,000	42,000	38,000
Options outstanding, weighted-average remaining contractual life			7 years 9 months		5 years 8 months 8 days	5 years 2 months 23 days	7 years 1 month 20 days	8 years 1 month 17 days	8 years 5 months 23 days	9 years 0 months 22 days	9 years 9 months 25 days	10 years	2 years 3 months 22 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 5.83		$ 5.83		$ 1.78	$ 2.67	$ 3.51	$ 4.79	$ 5.29	$ 6.77	$ 10.56	$ 14.54	$ 230.05
Options exercisable, number of options exercisable (in shares)	4,653,000		4,653,000		69,000	1,090,000	1,466,000	127,000	1,762,000	101,000	0	0	38,000
Options exercisable, weighted average exercise price (in dollars per share)	$ 5.89		$ 5.89		$ 1.77	$ 2.63	$ 3.52	$ 4.73	$ 5.26	$ 6.64	$ 0	$ 0	$ 230.05
Total unrecognized compensation cost	$ 14,000,000		$ 14,000,000
Weighted-average period over which compensation cost expected to be recognized			3 years