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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (13,282) $ (17,083) $ (27,167) $ (35,681)
Other comprehensive gains (losses)        
Unrealized gains (losses) on available-for-sale investments, net of taxes of zero for the three and six months ended June 30, 2018 and 2017 9 124 (320) (122)
Comprehensive loss $ (13,273) $ (16,959) $ (27,487) $ (35,803)