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v3.25.2

Summary of significant accounting policies - Narrative (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 22, 2017 | Jun. 30, 2025 USD ($) segment | Jun. 30, 2024 USD ($) segment | Jun. 30, 2025 USD ($) segment | Jun. 30, 2024 USD ($) segment | Dec. 31, 2025 USD ($) | Dec. 31, 2028 USD ($) | Jul. 01, 2027 USD ($) | Jul. 01, 2025 USD ($) | Dec. 31, 2024 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Number of reporting segments | segment |  |  |  | 1 | 1 |  |  |  |  |
Number of operating segments | segment |  | 1 | 1 | 1 | 1 |  |  |  |  |
Allowance for credit loss |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |
Increase in allowance for credit losses |  | 0 | $ 0 | 0 | $ 0 |  |  |  |  |
Allowance for doubtful accounts receivable |  | 10,700 |  | 10,700 |  |  |  |  |  | $ 2,300
Bad debt expense |  | 5,900 |  | 7,800 |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |  |  |  |
Federal income tax statutory rate | 21.00% |  |  |  |  |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |  |  |  |
Increase in current taxable income resulting from the elimination of current deduction of qualifying R&D costs under Section 174. |  |  |  |  |  | $ 5,300 |  |  |  |
Deposits and other assets |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Bank guarantee denominated in foreign currency |  | 700 |  | 700 |  |  |  |  |  |
Hopewell Campus |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Letters of credit |  |  |  |  |  |  |  |  | $ 3,000 |
Hopewell Campus | Deposits and other assets |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Letters of credit |  | 5,000 |  | 5,000 |  |  |  |  |  |
Warren Building under lease amendment |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Letters of credit |  |  |  |  |  |  | $ 2,500 | $ 5,000 |  |
Warren Building under lease amendment | Deposits and other assets |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Letters of credit |  | $ 10,000 |  | $ 10,000 |  |  |  |  |  |

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