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Fair value of financial instruments and investments - Marketable Securities, Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 23,104 | $ 377,287
Gross Unrealized, Gain | 5 | 107
Gross Unrealized, Loss | (499) | (709)
Fair Value | 22,610 | 376,685
Write downs of available for sale debt securities | 0 | 0
Increase in allowance for credit losses | 0 | 0
Realized gain (loss) from sale of marketable securities | 4,000 | 800
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 12,419 | 75,275
Gross Unrealized, Gain | 5 | 5
Gross Unrealized, Loss | 0 | (1)
Fair Value | 12,424 | 75,279
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 10,685 | 268,246
Gross Unrealized, Gain | 0 | 81
Gross Unrealized, Loss | (499) | (644)
Fair Value | $ 10,186 | 267,683
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 15,287
Gross Unrealized, Gain |  | 16
Gross Unrealized, Loss |  | (5)
Fair Value |  | 15,298
Government obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 18,479
Gross Unrealized, Gain |  | 5
Gross Unrealized, Loss |  | (59)
Fair Value |  | $ 18,425

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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