Share-based compensation - Equity Incentive Plan (Details) - Plan - USD ($) |
6 Months Ended | 12 Months Ended | |
|---|---|---|---|
Jun. 30, 2022 |
Dec. 31, 2021 |
Jun. 16, 2022 |
|
| Number of Shares | |||
| Common stock reserved for issuance | 1,250,000 | ||
| Outstanding at the beginning of the period | 749,147 | ||
| Granted | 262,500 | ||
| Outstanding at the end of the period | 1,011,647 | 749,147 | |
| Exercisable at June 30, 2022 | 635,454 | ||
| Weighted Average Exercise Price | |||
| Outstanding the beginning of the period | $ 9.03 | ||
| Granted | 4.23 | ||
| Outstanding at the end of the period | 7.79 | $ 9.03 | |
| Exercisable at June 30, 2022 | $ 9.41 | ||
| Weighted Average Remaining Contractual Term (years) | |||
| Weighted average remaining contractual term (years) | 8 years 11 months 15 days | 9 years 1 month 2 days | |
| Exercisable at June 30, 2022 | 8 years 6 months 18 days | ||
| Intrinsic value of options outstanding | $ 0 |
| X | ||||||||||
- Definition Aggregate number of common shares reserved for future issuance. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Gross number of share options (or share units) granted during the period. No definition available.
|
| X | ||||||||||
- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. No definition available.
|
| X | ||||||||||
- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|