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Preferred stock warrants - Classes of Preferred Stock Outstanding (Details) - Preferred stock warrant - USD ($) $ / shares in Units, $ in Thousands | Dec. 31, 2020 | May 31, 2020
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Preferred stock warrants |  |
Preferred shares issuable upon exercise of warrant | 6,219,170 |
Warrant fair value | $ 4,117 |
Series A1 Redeemable Convertible Preferred Stock | Liability |  |
Preferred stock warrants |  |
Warrant expiry term | 10 years |
Preferred shares issuable upon exercise of warrant | 3,823,524 |
Weighted average exercise price (in dollars per share) | $ 0.01 |
Warrant fair value | $ 1,875 |
Series B1 Redeemable Convertible Preferred Stock | Liability |  |
Preferred stock warrants |  |
Warrant expiry term | 10 years |
Preferred shares issuable upon exercise of warrant | 1,199,994 |
Weighted average exercise price (in dollars per share) | $ 0.01 |
Warrant fair value | $ 1,501 |
Series C1 Redeemable Convertible Preferred Stock |  |
Preferred stock warrants |  |
Warrant expiry term |  | 10 years
Weighted average exercise price (in dollars per share) |  | $ 1.15
Warrant fair value |  | $ 700
Series C1 Redeemable Convertible Preferred Stock | Liability |  |
Preferred stock warrants |  |
Warrant expiry term | 10 years |
Preferred shares issuable upon exercise of warrant | 1,195,652 |
Weighted average exercise price (in dollars per share) | $ 1.15 |
Warrant fair value | $ 741 |

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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=123467817&loc=d3e21475-112644 + Details
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- Definition 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 + Details
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