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Selected Quarterly Financial Data (Unaudited) - Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements, Captions                      
Revenues $ 17,071 $ 6,966 $ 13,798 $ 25,374 $ 33,966 $ 27,674 $ 12,087 $ 17,962 $ 63,209 $ 91,689 $ 79,256
Income (Loss) From Operations (12,367) (22,927) (30,272) (37,713) (29,016) (28,605) (33,491) (39,512) (103,279) (130,624) (127,171)
Net loss $ (16,781) $ (27,396) $ (34,549) $ (41,822) $ (26,609) $ (29,809) $ (34,657) $ (31,918) $ (120,548) $ (122,993) $ (131,445)
Earnings Per Share, Basic and Diluted $ (0.16) $ (0.26) $ (0.33) $ (0.40) $ (0.25) $ (0.28) $ (0.33) $ (0.31) $ (1.14) $ (1.17) $ (1.27)
Weighted Average Number of Shares Outstanding, Basic and Diluted 105,920 105,881 105,848 105,668 105,588 105,582 105,300 104,461 105,830 105,237 103,863