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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]      
Net loss $ (145,618) $ (59,802) $ (35,070)
Other comprehensive income (loss):      
Unrealized gain (loss) on available-for-sale securities (694) (185) 11
Total comprehensive loss $ (146,312) $ (59,987) $ (35,059)