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Quarterly Financial Data (unaudited) - Summary of Unaudited Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Selected Quarterly Financial Information [Abstract]                      
Revenue $ 2,414 $ 198     $ 5 $ 111 $ 17   $ 476 $ 133  
Operating expenses 99,248 83,911 $ 78,441 $ 69,954 70,554 65,894 58,070 $ 53,622 331,554 248,140 $ 147,738
Net loss $ (81,731) $ (79,227) $ (72,891) $ (68,290) $ (71,287) $ (64,907) $ (56,923) $ (52,757) $ (302,139) $ (245,874) $ (145,618)
Net loss per share, basic and diluted $ (1.89) $ (1.87) $ (1.72) $ (1.63) $ (1.75) $ (1.64) $ (1.46) $ (1.35) $ (7.12) $ (6.21) $ (3.96)