Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Net loss $ (9,158) $ (4,295)
Other comprehensive income, net of tax    
Unrealized gain on marketable securities 42 8
Comprehensive loss $ (9,116) $ (4,287)