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Summary of significant accounting policies - Level 3 Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Beginning balance | $ 428 | $ 144 | $ 50
Change in fair value of redeemable convertible preferred stock warrants | (160) | 52 | 58
Vesting and remeasurement of stock appreciation rights | 550 | 232 | 36
Ending balance |  | 428 | 144
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Purchases of strategic investments | 10,000 |  |
Ending balance, asset (liability) | 10,818 |  |
Strategic Investments |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Beginning balance | 0 |  |
Purchases of strategic investments | 10,000 |  |
Ending balance | 10,000 | 0 |
Warrants |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Beginning balance | 160 | 108 | 50
Change in fair value of redeemable convertible preferred stock warrants | (160) | 52 | 58
Ending balance | 0 | 160 | 108
SARs |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Beginning balance | 268 | 36 |
Vesting and remeasurement of stock appreciation rights | 550 | 232 | 36
Ending balance | $ 818 | $ 268 | $ 36

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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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