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Common stock and common stock warrants (Tables) | 9 Months Ended
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Sep. 30, 2021
Common stock and common stock warrant |
Preferred stock warrants |
Schedule of warrants to purchase the following classes of preferred stock outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2021
​ | ​ | ​ |  | ​ |  | Shares of |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | common stock | ​ | ​ | ​
​ | ​ | ​ | ​ | Balance sheet | ​ | issuable upon | ​ | Weighted average
Issuance date |  | Contractual term |  | classification |  | exercise of warrant |  | exercise price
​ | ​ | (in years) | ​ | ​ | ​ | ​ | ​ | ​ | ​
July 24, 2017 | ​ | 10 | ​ | Equity | ​ | 25,835 | ​ | $ | 295.15
April 12, 2018 | ​ | 10 | ​ | Equity | ​ | 30,000 | ​ | $ | 1.00
July 14, 2021 | ​ | 10 | ​ | Equity | ​ | 975,109 | ​ | $ | 1.46
​ | ​ | ​ | ​ | ​ | ​ | 1,030,944 | ​ | ​ | ​
​ As of December 31, 2020, outstanding warrants to purchase common stock outstanding consisted of the following:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2020
​ | ​ | ​ |  | ​ |  | Shares of |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | common stock | ​ | ​ | ​
​ | ​ | ​ | ​ | Balance sheet | ​ | issuable upon | ​ | Weighted average
Issuance date |  | Contractual term |  | classification |  | exercise of warrant |  | exercise price
​ | ​ | (in years) | ​ | ​ | ​ | ​ | ​ | ​ | ​
July 24, 2017 | ​ | 10 | ​ | Equity | ​ | 25,835 | ​ | $ | 295.15
April 12, 2018 | ​ | 10 | ​ | Equity | ​ | 30,000 | ​ | $ | 1.00
​ | ​ | ​ | ​ | ​ | ​ | 55,835 | ​ | ​ | ​

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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