Condensed Consolidated Statements of Comprehensive Loss (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Net loss $ (15,470) $ (54,265)
Other comprehensive income, net of tax:    
Foreign currency translation adjustment 148 142
Unrealized gains on marketable securities 144 147
Other comprehensive income, net of tax 292 289
Comprehensive loss $ (15,178) $ (53,976)