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v3.20.2

Fair value of financial instruments and marketable securities - Available for sale (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |
Write downs of available for sale debt securities | $ 0 | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 53 | 53 | $ 28
Amortized Cost | 704,653 | 704,653 | 397,776
Gross Unrealized, Gain | 2,449 | 2,449 | 787
Gross Unrealized, Loss | (53) | (53) | (28)
Fair Value | 707,049 | 707,049 | 398,535
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 53 | 53 | 28
Commercial paper |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 16 | 16 |
Amortized Cost | 260,392 | 260,392 | 157,936
Gross Unrealized, Gain | 74 | 74 | 162
Gross Unrealized, Loss | (16) | (16) | 0
Fair Value | 260,450 | 260,450 | 158,098
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 16 | 16 |
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 | 19 | 19 | 20
Amortized Cost | 316,198 | 316,198 | 188,778
Gross Unrealized, Gain | 2,082 | 2,082 | 576
Gross Unrealized, Loss | (19) | (19) | (20)
Fair Value | 318,261 | 318,261 | 189,334
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 19 | 19 | 20
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 | 2 | 2 | 8
Amortized Cost | 35,461 | 35,461 | 51,062
Gross Unrealized, Gain | 232 | 232 | 49
Gross Unrealized, Loss | (2) | (2) | (8)
Fair Value | 35,691 | 35,691 | 51,103
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 2 | 2 | $ 8
Government obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 16 | 16 |
Amortized Cost | 92,602 | 92,602 |
Gross Unrealized, Gain | 61 | 61 |
Gross Unrealized, Loss | (16) | (16) |
Fair Value | 92,647 | 92,647 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 16 | $ 16 |

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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 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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