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Preferred stock warrants (Details) - USD ($) $ / shares in Units, $ in Thousands | Dec. 31, 2020 | May 31, 2020
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2020 Term Loan | Series C1 Redeemable Convertible Preferred Stock |  |
Class of Warrant or Right [Line Items] |  |
Shares issued upon conversion of warrant |  | 1,195,652
Exercise price |  | $ 1.15
Preferred stock warrant |  |
Class of Warrant or Right [Line Items] |  |
Warrant fair value | $ 4,117 |
Preferred stock warrant | Series C1 Redeemable Convertible Preferred Stock |  |
Class of Warrant or Right [Line Items] |  |
Exercise price |  | $ 1.15
Warrant expiry term |  | 10 years
Warrant fair value |  | $ 700

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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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