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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS    
Net loss $ (7,102) $ (3,895)
Unrealized gains (losses) on securities:    
Holding gains (losses) arising during period, net of tax 77 (87)
Reclassification adjustment for (gains) losses included in net loss   (6)
Net unrealized gains (losses) on securities 77 (93)
Total comprehensive loss $ (7,025) $ (3,988)