Consolidated Statements of Comprehensive Loss (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net loss $ (49,963) $ (38,759) $ (3,415)
Available-for-sale securities:      
Unrealized gains (loss) during the period, net (34) (15) 9
Reclassification adjustment (6)   (1)
Other comprehensive income (loss) (40) (15) 8
Comprehensive loss $ (50,003) $ (38,774) $ (3,407)