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Net loss per share per share - Securities excluded from the diluted per share calculation (Details) - shares |  | 9 Months Ended |
--- | --- | --- | ---
Mar. 07, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | May 28, 2019
Antidilutive securities |  |  |  |
Antidilutive securities (in shares) |  | 3,779,785 | 2,751,595 |
Remaining warrants exercisable |  |  | 80,000 | 80,000
Warrants to subscribe for convertible preferred shares (as adjusted to reflect the impact of the share capital reorganization and issuance of bonus shares |  |  |  |
Antidilutive securities |  |  |  |
Antidilutive securities (in shares) |  |  | 114,320 |
Percentage of warrants exercise in conjunction with IPO | 50.00% |  |  |
Percentage of warrants expire | 50.00% |  |  |
Number of ordinary shares for warrants exercise |  |  | 114,320 |
Options to purchase ordinary shares |  |  |  |
Antidilutive securities |  |  |  |
Antidilutive securities (in shares) |  | 3,779,785 | 2,637,275 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
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