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Employee benefit plans - Allocation of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |
Total stock-based compensation expense |  | $ 7,791 | $ 11,117 | $ 16,561 | $ 21,431
Share-based Payment Arrangement, Expense, Tax Benefit |  |  | 2,500 | 0 | 4,800
Unearned stock-based compensation, expected recognition period | 2 years 5 months 1 day |  |  |  |
Cost of Revenue [Member] |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |
Total stock-based compensation expense |  | 339 | 530 | 754 | 996
Research and Development [Member] |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |
Total stock-based compensation expense |  | 4,016 | 4,922 | 8,281 | 9,668
Selling and Marketing Expense [Member] |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |
Total stock-based compensation expense |  | 1,545 | 2,359 | 3,289 | 4,537
General and Administrative [Member] |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |
Total stock-based compensation expense |  | $ 1,891 | $ 3,306 | $ 4,237 | $ 6,230

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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