Quarterly Financial Data (Unaudited) - Schedule of Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2019 |
Sep. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Quarterly Financial Information Disclosure [Abstract] | |||||||||||
| Revenue | $ 37 | $ 239 | $ 254 | $ 185 | $ 191 | $ 37 | $ 869 | $ 508 | |||
| Total operating expenses | $ (23,178) | $ (30,999) | $ (27,378) | (20,503) | (24,183) | (25,240) | (15,611) | (12,394) | (102,058) | (77,428) | (29,963) |
| Net loss | (23,641) | (31,271) | (27,638) | (20,580) | (24,258) | (24,905) | (15,747) | (12,146) | (103,130) | (77,056) | (29,406) |
| Net loss attributable to ordinary shareholders | $ (23,641) | $ (31,271) | $ (27,638) | $ (20,580) | $ (24,258) | $ (24,905) | $ (15,747) | $ (12,146) | $ (103,130) | $ (77,056) | $ (29,406) |
| Net loss per share attributable to ordinary shareholders – basic and diluted | $ (1.59) | $ (2.15) | $ (1.93) | $ (1.44) | $ (1.72) | $ (1.77) | $ (2.22) | $ (61.36) | $ (7.10) | $ (8.82) | $ (170.84) |
| Weighted average ordinary shares outstanding – basic and diluted | 14,866,838 | 14,571,278 | 14,340,231 | 14,290,437 | 14,108,604 | 14,034,631 | 7,085,655 | 197,949 | 14,518,036 | 8,734,109 | 172,130 |
| X | ||||||||||
- 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
|
| X | ||||||||||
- 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
|
| X | ||||||||||
- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- 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://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- 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.
|