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Fair value of financial instruments and marketable securities - Available for sale (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |
Write downs of available for sale debt securities | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 144 | $ 75
Amortized Cost | 641,471 | 892,938
Gross Unrealized, Gain | 750 | 1,975
Gross Unrealized, Loss | (144) | (75)
Fair Value | 642,077 | 894,838
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 144 | 75
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 37
Amortized Cost | 252,778 | 276,855
Gross Unrealized, Gain | 25 | 19
Gross Unrealized, Loss | (1) | (37)
Fair Value | 252,802 | 276,837
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1 | 37
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 139 | 29
Amortized Cost | 330,781 | 474,030
Gross Unrealized, Gain | 591 | 1,658
Gross Unrealized, Loss | (139) | (29)
Fair Value | 331,233 | 475,659
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 139 | 29
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 3
Amortized Cost | 19,216 | 28,681
Gross Unrealized, Gain | 104 | 210
Gross Unrealized, Loss |  | (3)
Fair Value | 19,320 | 28,888
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | 3
Government obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4 | 6
Amortized Cost | 38,696 | 113,372
Gross Unrealized, Gain | 30 | 88
Gross Unrealized, Loss | (4) | (6)
Fair Value | 38,722 | 113,454
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 4 | $ 6

X
- 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 http://asc.fasb.org/extlink&oid=121645371&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 http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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