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Common stock and convertible preferred stock - Warrants (Details) $ / shares in Units, $ in Millions | 6 Months Ended
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Jun. 30, 2021 USD ($) $ / shares shares
Class of Warrant or Right [Line Items] |
Gross proceeds from issuance of warrants | $ | $ 0.9
Warrants |
Class of Warrant or Right [Line Items] |
Warrant liability | $ | $ 7.1
Warrants exercised, numbers | 100,695
Exercise of common stock warrants (shares) | 100,695
Additional warrants exercised on cashless | 72,320
Shares issued in cashless exercise | 45,322
Warrants | Exercise Price $9.00 |
Class of Warrant or Right [Line Items] |
Warrants outstanding | 862,181
Exercise price | $ / shares | $ 9.00
Warrants | Exercise Price $45.00 |
Class of Warrant or Right [Line Items] |
Warrants outstanding | 500,000
Exercise price | $ / shares | $ 45.00

X
- Definition Number of cashless warrants exercised. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Number shares issued in cashless exercise of warrants. + References No definition available. + Details
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- Definition Shares issued on exercise of warrant. + References No definition available. + Details
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Balance Type: | na
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X
- Definition The amount of warrant liability as at the end of the reporting period. + References No definition available. + Details
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- Definition Number of warrants exercised + References No definition available. + Details
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- Definition 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=109259400&loc=d3e21475-112644 + Details
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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 Number of warrants or rights outstanding. + References No definition available. + Details
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- Definition The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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