Stockholders' equity - Common stock for future issuance (Details) - shares |
Dec. 31, 2022 |
Dec. 31, 2021 |
|---|---|---|
| Equity [Abstract] | ||
| Exercise of options to purchase common stock (in shares) | 3,071,187 | 2,684,041 |
| Exercise of warrants to purchase common stock (in shares) | 9,433,584 | 9,433,584 |
| Total (in shares) | 12,504,771 | 12,117,625 |
| X | ||||||||||
- Definition Number of share options (or share units) exercised during the current period. No definition available.
|
| X | ||||||||||
- Definition Warrants reserved to purchases shares of common stock. No definition available.
|
| 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.
|