Shareholders' (Deficit) / Equity - Reconciliation of the Company's Beginning and Ending Balances in Shareholders' (Deficit) / Equity (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2019 |
Jun. 30, 2020 |
Jun. 30, 2019 |
Dec. 31, 2019 |
|
| Equity [Abstract] | |||||
| Shareholders' equity (deficit), Beginning Balance | $ (26,238) | $ 71,622 | $ 71,622 | ||
| Exercise of share options | 59 | ||||
| Share-based compensation expense | 1,783 | 1,113 | |||
| Issuance of ordinary shares, net | 2,564 | ||||
| Issuance of warrants | 1,723 | ||||
| Net loss | $ (12,521) | $ (27,638) | (28,621) | (48,218) | (103,130) |
| Shareholders' equity (deficit), Ending Balance | $ (48,789) | $ 24,576 | $ (48,789) | $ 24,576 | $ (26,238) |
| X | ||||||||||
- Definition Issuance of warrants. No definition available.
|
| X | ||||||||||
- References No definition available.
|
| 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 Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Value, after forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Value of stock issued as a result of the exercise of stock options. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|