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Cash and cash equivalents - Short-Term Deposits, Classified as Cash Equivalents (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Cash And Cash Equivalents [Line Items] |  |
Principal | $ 345,949 | $ 43,396
Short-term deposits, classified as cash equivalents | $ 1,099,441 | $ 237,655
Short term deposit One [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.95% | 0.58%
Principal | $ 42,998 | $ 200,000
Interest accrued to date | 609 | 100
Short-term deposits, classified as cash equivalents | $ 43,607 | $ 200,100
Short term deposit Two [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.94% | 0.31%
Principal | $ 100,817 | $ 1,250
Interest accrued to date | 537 |
Short-term deposits, classified as cash equivalents | $ 101,354 | $ 1,250
Short term deposit Three [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.96% | 0.36%
Principal | $ 41,421 | $ 8,000
Interest accrued to date | 343 | 2
Short-term deposits, classified as cash equivalents | $ 41,764 | $ 8,002
Short term deposit Four [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.96% | 0.28%
Principal | $ 100,660 | $ 500
Interest accrued to date | 644 |
Short-term deposits, classified as cash equivalents | $ 101,304 | $ 500
Short term deposit Five [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.95% | 3.12%
Principal | $ 32,248 | $ 3,550
Interest accrued to date | 458 | 2
Short-term deposits, classified as cash equivalents | $ 32,706 | $ 3,552
Short term deposit Six [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.95% | 0.26%
Principal | $ 73,831 | $ 2,500
Interest accrued to date | 1,070 |
Short-term deposits, classified as cash equivalents | $ 74,901 | $ 2,500
Short term deposit Seven [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.96% | 0.40%
Principal | $ 30,146 | $ 1,500
Interest accrued to date | 183 |
Short-term deposits, classified as cash equivalents | $ 30,329 | $ 1,500
Short term deposit Eight [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.95% | 0.40%
Principal | $ 103,288 | $ 1,500
Interest accrued to date | 523 |
Short-term deposits, classified as cash equivalents | $ 103,811 | $ 1,500
Short term deposit Nine [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.94% | 0.30%
Principal | $ 20,710 | $ 5,000
Interest accrued to date | 168 | 1
Short-term deposits, classified as cash equivalents | $ 20,878 | $ 5,001
Short term deposit Ten [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.96% | 0.37%
Principal | $ 50,330 | $ 1,000
Interest accrued to date | 322 |
Short-term deposits, classified as cash equivalents | $ 50,652 | $ 1,000
Short term deposit Eleven [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.98% | 0.34%
Principal | $ 100,487 | $ 2,000
Interest accrued to date | 621 |
Short-term deposits, classified as cash equivalents | $ 101,108 | $ 2,000
Short term deposit Twelve [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.96% | 0.27%
Principal | $ 70,341 | $ 2,750
Interest accrued to date | 428 |
Short-term deposits, classified as cash equivalents | $ 70,769 | $ 2,750
Short term deposit Thirteen [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.97% | 0.06%
Principal | $ 100,258 | $ 3,000
Interest accrued to date | 584 |
Short-term deposits, classified as cash equivalents | $ 100,842 | $ 3,000
Short term deposit Fourteen [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 4.54% | 0.07%
Principal | $ 82,000 | $ 5,000
Interest accrued to date | 424 |
Short-term deposits, classified as cash equivalents | $ 82,424 | 5,000
Short term deposit Fifteen [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 4.54% |
Principal | $ 122,000 |
Interest accrued to date | 631 |
Short-term deposits, classified as cash equivalents | $ 122,631 |
Short term deposit Sixteen [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.42% |
Principal | $ 2,000 |
Interest accrued to date | 7 |
Short-term deposits, classified as cash equivalents | $ 2,007 |
Short term deposit Seventeen [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.44% |
Principal | $ 1,500 |
Interest accrued to date | 6 |
Short-term deposits, classified as cash equivalents | $ 1,506 |
Short term deposit Eighteen [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.22% |
Principal | $ 2,103 |
Interest accrued to date | 1 |
Short-term deposits, classified as cash equivalents | $ 2,104 |
Short term deposit Nineteen [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.95% |
Principal | $ 600 |
Interest accrued to date | 2 |
Short-term deposits, classified as cash equivalents | $ 602 |
Short term deposit Twenty [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 1.02% |
Principal | $ 500 |
Interest accrued to date | 2 |
Short-term deposits, classified as cash equivalents | $ 502 |
Short term deposit Twenty One [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.46% |
Principal | $ 1,000 |
Interest accrued to date | 4 |
Short-term deposits, classified as cash equivalents | $ 1,004 |
Short term deposit Twenty Two [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.42% |
Principal | $ 700 |
Interest accrued to date | 2 |
Short-term deposits, classified as cash equivalents | $ 702 |
Short term deposit Twenty Three [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 1.07% |
Principal | $ 1,700 |
Interest accrued to date | 3 |
Short-term deposits, classified as cash equivalents | $ 1,703 |
Short term deposit Twenty Four [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.66% |
Principal | $ 1,000 |
Interest accrued to date | 3 |
Short-term deposits, classified as cash equivalents | $ 1,003 |
Short term deposit Twenty Five [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.64% |
Principal | $ 2,500 |
Interest accrued to date | 15 |
Short-term deposits, classified as cash equivalents | $ 2,515 |
Short term deposit Twenty Six [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.72% |
Principal | $ 2,200 |
Interest accrued to date | 1 |
Short-term deposits, classified as cash equivalents | $ 2,201 |
Short term deposit Twenty Seven [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.96% |
Principal | $ 500 |
Short-term deposits, classified as cash equivalents | $ 500 |
Short term deposit Twenty Eight [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.58% |
Principal | $ 1,500 |
Interest accrued to date | 8 |
Short-term deposits, classified as cash equivalents | $ 1,508 |
Short term deposit Twenty Nine [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.38% |
Principal | $ 1,500 |
Interest accrued to date | 3 |
Short-term deposits, classified as cash equivalents | $ 1,503 |
Short term deposit Thirty [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Short term deposits, Interest rate | 0.87% |
Principal | $ 1,000 |
Interest accrued to date | 1 |
Short-term deposits, classified as cash equivalents | 1,001 |
Short Term Deposits Classified As Cash Equivalents [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Principal | 1,091,838 | 237,550
Interest accrued to date | 7,603 | 105
Short-term deposits, classified as cash equivalents | $ 1,099,441 | $ 237,655

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