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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]      
Net loss $ (57,564) $ (60,585) $ (62,906)
Other comprehensive loss:      
Unrealized losses on available-for-sale investments, net of taxes (184) (200) (7,186)
Comprehensive loss $ (57,748) $ (60,785) $ (70,092)