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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net loss $ (43,337) $ (15,917) $ (16,982)
Other comprehensive income (loss):      
Net unrealized gains (losses) on available-for-sale securities, net of taxes 7   (108)
Comprehensive loss $ (43,330) $ (15,917) $ (17,090)