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 |