CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Unrealized change in available-for-sale and non-marketable securities, Tax $ 0 $ 0
Unrealized change in cash flow hedges, Tax $ 0 $ 0