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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
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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Number of common stock shares issuable upon exercise of warrant.

+ References

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Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644

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Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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