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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]    
Net loss $ (10,402) $ (27,890)
Other comprehensive income (loss):    
Unrealized gain (loss) on marketable securities, net of tax (14) 94
Total comprehensive loss $ (10,416) $ (27,796)