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Fair value of financial instruments and marketable securities - Unrealized Loss Positions (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Unrealized losses |  |  |
Securities in an unrealized loss position less than 12 months | $ (50) | $ (50) | $ (75)
Total | (50) | (50) | (75)
Fair Value |  |  |
Securities in an unrealized loss position less than 12 months | 117,895 | 117,895 | 260,970
Total | 117,895 | 117,895 | 260,970
Write downs of available for sale debt securities | 0 | 0 |
Commercial paper |  |  |
Unrealized losses |  |  |
Securities in an unrealized loss position less than 12 months | (1) | (1) | (37)
Total | (1) | (1) | (37)
Fair Value |  |  |
Securities in an unrealized loss position less than 12 months | 7,991 | 7,991 | 129,630
Total | 7,991 | 7,991 | 129,630
Corporate debt securities |  |  |
Unrealized losses |  |  |
Securities in an unrealized loss position less than 12 months | (48) | (48) | (29)
Total | (48) | (48) | (29)
Fair Value |  |  |
Securities in an unrealized loss position less than 12 months | 80,058 | 80,058 | 102,426
Total | 80,058 | 80,058 | 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 | (1) | (1) | (6)
Total | (1) | (1) | (6)
Fair Value |  |  |
Securities in an unrealized loss position less than 12 months | 29,846 | 29,846 | 27,084
Total | $ 29,846 | $ 29,846 | $ 27,084

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