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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (12,354) $ (18,965) $ (41,477) $ (62,034)
Change in unrealized gain (loss) on available-for-sale securities, net of tax 12 (14) (131) 77
Comprehensive loss $ (12,342) $ (18,979) $ (41,608) $ (61,957)