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Stock compensation and other employee benefit plans - Stock compensation expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock compensation expense | $ 61,765 | $ 1,818 | $ 906
Cost of Sales [Member] |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock compensation expense | 8,094 | 322 | 176
Research and Development Expense [Member] |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock compensation expense | 3,657 | 57 | 51
Selling and Marketing Expense [Member] |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock compensation expense | 2,056 | 38 | 26
General and Administrative Expense [Member] |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock compensation expense | $ 47,958 | $ 1,401 | $ 653

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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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