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Fair value of financial instruments and investments - Marketable Securities, Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | $ 397,776 | $ 58,056
Gross Unrealized Gains | 787 | 43
Gross Unrealized Losses | (28) | (11)
Fair Value | 398,535 | 58,088
Commercial paper |  |
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | 157,936 | 31,657
Gross Unrealized Gains | 162 | 43
Gross Unrealized Losses | 0 | (1)
Fair Value | 158,098 | 31,699
Corporate debt securities |  |
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | 188,778 | 26,399
Gross Unrealized Gains | 576 | 0
Gross Unrealized Losses | (20) | (10)
Fair Value | 189,334 | $ 26,389
Asset-backed securities |  |
Marketable securities accounted for as available-for-sale securities |  |
Amortized Cost | 51,062 |
Gross Unrealized Gains | 49 |
Gross Unrealized Losses | (8) |
Fair Value | $ 51,103 |

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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=118939692&loc=d3e27161-111563 + Details
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