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Fair value of financial instruments and marketable securities - Unrealized Loss Positions (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months | $ (144) | $ (75)
Total | (144) | (75)
Fair Value |  |
Securities in an unrealized loss position less than 12 months | 266,050 | 260,970
Total | 266,050 | 260,970
Write downs of available for sale debt securities | 0 |
Commercial paper |  |
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months | (1) | (37)
Total | (1) | (37)
Fair Value |  |
Securities in an unrealized loss position less than 12 months | 69,096 | 129,630
Total | 69,096 | 129,630
Corporate debt securities |  |
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months | (139) | (29)
Total | (139) | (29)
Fair Value |  |
Securities in an unrealized loss position less than 12 months | 177,817 | 102,426
Total | 177,817 | 102,426
Asset-backed securities |  |
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months |  | (3)
Total |  | (3)
Fair Value |  |
Securities in an unrealized loss position less than 12 months |  | 1,830
Total |  | 1,830
Government obligations |  |
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months | (4) | (6)
Total | (4) | (6)
Fair Value |  |
Securities in an unrealized loss position less than 12 months | 19,137 | 27,084
Total | $ 19,137 | $ 27,084

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