Interim Financial Information (Unaudited) (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 |
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| Quarterly Financial Information Disclosure [Abstract] | |||||||||||
| Total revenue | $ 1,872 | $ 799 | $ 813 | $ 6,801 | $ 5,441 | $ 0 | $ 0 | $ 0 | $ 10,286 | $ 5,441 | $ 0 |
| Loss from operations | (31,287) | (34,384) | (36,658) | (25,392) | (35,852) | (26,095) | (32,899) | (143,721) | (127,720) | (238,567) | (93,730) |
| Net loss | $ (31,516) | $ (33,191) | $ (35,854) | $ (25,184) | $ (34,723) | $ (22,864) | $ (32,523) | $ (141,349) | $ (125,745) | $ (231,459) | $ (96,655) |
| Basic and diluted (in dollars per share) | $ (0.14) | $ (0.15) | $ (0.17) | $ (0.12) | $ (0.18) | $ (0.12) | $ (0.17) | $ (0.92) | $ (0.59) | $ (1.23) | $ (1.01) |
| Weighted average shares outstanding - basic and diluted (in shares) | 217,408 | 217,380 | 206,531 | 204,772 | 194,978 | 192,405 | 186,102 | 154,213 | 211,574 | 188,536 | 95,795 |
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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The net result for the period of deducting operating expenses from operating revenues. No definition available.
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- References No definition available.
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS). No definition available.
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