INCOME TAXES (Detail Textuals) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Operating Loss Carryforwards [Line Items]
Increase in ownership percentage of certain stockholders or public groups	more than 50 percentage points
Ownership change, increase in ownership percentage, term	3 years
Research and development credit carryforwards
Operating Loss Carryforwards [Line Items]
Research and development credit carryforwards	24,885
Federal income tax
Operating Loss Carryforwards [Line Items]
Net operating loss	265,004
Federal net capital loss carryforwards	571
Net operating loss generated from excess tax deduction from share based awards	15,003
State income tax
Operating Loss Carryforwards [Line Items]
Net operating loss	113,262
Net operating loss generated from excess tax deduction from share based awards	907