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Stock compensation and other employee benefit plans - Summary of outstanding restricted stock unit and restricted stock awards (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Granted, Shares | 2,107,500
Vested, Shares | (7,538,265)
Stock-based compensation cost not yet recognized | $ | $ 10,301
Weighted-average remaining expense recognition period (in years) | 5 years 10 days
Restricted stock units [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Nonvested, beginning balance, Shares | 12,943,811
Granted, Shares | 5,470,137
Vested, Shares | (12,883,918)
Forfeited, Shares | (388,561)
Nonvested, ending balance, Shares | 5,141,469
Nonvested, beginning balance, Dollars per share | $ / shares | $ 3.15
Granted | $ / shares | 7.72
Vested | $ / shares | 3.87
Forfeited | $ / shares | 4.68
Nonvested, ending balance, Dollars per share | $ / shares | $ 6.08
Stock-based compensation cost not yet recognized | $ | $ 21,396
Weighted-average remaining expense recognition period (in years) | 2 years 11 months 12 days
Restricted Stock Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Nonvested, beginning balance, Shares | 1,169,601
Granted, Shares | 0
Vested, Shares | (1,169,601)
Forfeited, Shares | 0
Nonvested, ending balance, Shares | 0
Nonvested, beginning balance, Dollars per share | $ / shares | $ 0.07
Granted | $ / shares | 0
Vested | $ / shares | 0.07
Forfeited | $ / shares | 0
Nonvested, ending balance, Dollars per share | $ / shares | $ 0

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- Definition Weighted-average remaining expense recognition period (in years) + References No definition available. + Details
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- Definition Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost. + References No definition available. + 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 Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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