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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (26,575) $ (12,126) $ (43,069) $ (17,445)
Change in unrealized gain (loss) on available-for-sale securities, net 8 (28) 91 22
Comprehensive loss $ (26,567) $ (12,154) $ (42,978) $ (17,423)