CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
REVENUES (see Note 9(c))	$ 34,870	$ 8,386	$ 6,642
COMPANY'S SHARE IN COLLABORATION AGREEMENT	(446)	(5,418)	4,602
COST OF REVENUES	(8,144)	(1,525)	(4,383)
GROSS PROFIT	26,280	1,443	6,861
RESEARCH AND DEVELOPMENT EXPENSES	(36,665)	(37,818)	(37,691)
Less - grants and reimbursements	7,976	6,775	7,740
RESEARCH AND DEVELOPMENT EXPENSES, NET	(28,689)	(31,043)	(29,951)
GENERAL AND ADMINISTRATIVE EXPENSES	(9,763)	(6,931)	(6,876)
OPERATING LOSS	(12,172)	(36,531)	(29,966)
FINANCIAL INCOME - NET	554	2	968
NET LOSS FOR THE YEAR	$ (11,618)	$ (36,529)	$ (28,998)
NET LOSS PER SHARE OF COMMON STOCK - BASIC AND DILUTED:	$ (0.13)	$ (0.43)	$ (0.36)
WEIGHTED AVERAGE NUMBER OF SHARES OF COMMON STOCK USED IN COMPUTING LOSS PER SHARE OF COMMON STOCK, BASIC AND DILUTED:	90,845,901	84,645,364	80,960,300