STOCKHOLDERS' EQUITY (Details 9)	Dec. 31, 2012	May 17, 2012	Dec. 31, 2011
Authorized Common Stock
Authorized Common Stock (in shares)	300,000,000	300,000,000	200,000,000
STOCKHOLDERS' EQUITY
Outstanding stock options (in shares)	17,811,506		14,355,548
Options and awards available for grant (in shares)	13,557,771		14,473,498
Warrants outstanding (in shares)	1,619,275
Total (in shares)	33,344,942
Purchase Plan
STOCKHOLDERS' EQUITY
Options and awards available for grant (in shares)	356,390