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Fair value of financial instruments and marketable securities - Available for sale (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 2 | $ 28
Amortized Cost | 337,021 | 397,776
Gross Unrealized, Gain | 3,411 | 787
Gross Unrealized, Loss | (2) | (28)
Fair Value | 340,430 | 398,535
Securities in an unrealized loss position less than 12 months | 9,196 | 95,990
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Securities in an unrealized loss position greater than 12 months | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 2 | 28
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 9,196 | 95,990
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 53,638 | 157,936
Gross Unrealized, Gain | 178 | 162
Gross Unrealized, Loss | 0 | 0
Fair Value | 53,816 | 158,098
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 |  | 20
Amortized Cost | 221,068 | 188,778
Gross Unrealized, Gain | 2,882 | 576
Gross Unrealized, Loss | 0 | (20)
Fair Value | 223,950 | 189,334
Securities in an unrealized loss position less than 12 months |  | 71,779
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Securities in an unrealized loss position greater than 12 months |  | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | 20
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value |  | 71,779
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 | 1 | 8
Amortized Cost | 44,492 | 51,062
Gross Unrealized, Gain | 332 | 49
Gross Unrealized, Loss | (1) | (8)
Fair Value | 44,823 | 51,103
Securities in an unrealized loss position less than 12 months | 594 | 24,211
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Securities in an unrealized loss position greater than 12 months | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1 | 8
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 594 | $ 24,211
Government obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 |
Amortized Cost | 17,823 |
Gross Unrealized, Gain | 19 |
Gross Unrealized, Loss | (1) |
Fair Value | 17,841 |
Securities in an unrealized loss position less than 12 months | 8,602 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Securities in an unrealized loss position greater than 12 months | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | $ 8,602 |

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=118939692&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=118939692&loc=d3e27161-111563 + Details
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