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Common stock and common stock warrants - Warrants (Details) - Common stock and common stock warrant - $ / shares | Sep. 30, 2021 | Dec. 31, 2020
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Common stock and common stock warrants |  |
Common stock shares issuable upon exercise of warrant | 1,030,944 | 55,835
Equity | July 24, 2017 |  |
Common stock and common stock warrants |  |
Contractual term (in years) | 10 years | 10 years
Common stock shares issuable upon exercise of warrant | 25,835 | 25,835
Weighted average exercise price (in dollars per share) | $ 295.15 | $ 295.15
Equity | April 12, 2018 |  |
Common stock and common stock warrants |  |
Contractual term (in years) | 10 years | 10 years
Common stock shares issuable upon exercise of warrant | 30,000 | 30,000
Weighted average exercise price (in dollars per share) | $ 1.00 | $ 1.00
Equity | July 14, 2021 |  |
Common stock and common stock warrants |  |
Contractual term (in years) | 10 years |
Common stock shares issuable upon exercise of warrant | 975,109 |
Weighted average exercise price (in dollars per share) | $ 1.46 |

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