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Fair value of financial instruments and marketable securities - Unrealized Loss Positions (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Unrealized losses |  |  |
Securities in an unrealized loss position less than 12 months | $ (53) | $ (53) | $ (28)
Securities in an unrealized loss position greater than 12 months | 0 | 0 | 0
Total | (53) | (53) | (28)
Fair Value |  |  |
Securities in an unrealized loss position less than 12 months | 151,245 | 151,245 | 95,990
Securities in an unrealized loss position greater than 12 months | 0 | 0 | 0
Total | 151,245 | 151,245 | 95,990
Write downs of available for sale debt securities | 0 | 0 |
Commercial paper |  |  |
Unrealized losses |  |  |
Securities in an unrealized loss position less than 12 months | (16) | (16) |
Securities in an unrealized loss position greater than 12 months | 0 | 0 |
Total | (16) | (16) |
Fair Value |  |  |
Securities in an unrealized loss position less than 12 months | 53,580 | 53,580 |
Securities in an unrealized loss position greater than 12 months | 0 | 0 |
Total | 53,580 | 53,580 |
Corporate debt securities |  |  |
Unrealized losses |  |  |
Securities in an unrealized loss position less than 12 months | (19) | (19) | (20)
Securities in an unrealized loss position greater than 12 months | 0 | 0 | 0
Total | (19) | (19) | (20)
Fair Value |  |  |
Securities in an unrealized loss position less than 12 months | 62,811 | 62,811 | 71,779
Securities in an unrealized loss position greater than 12 months | 0 | 0 | 0
Total | 62,811 | 62,811 | 71,779
Asset-backed securities |  |  |
Unrealized losses |  |  |
Securities in an unrealized loss position less than 12 months | (2) | (2) | (8)
Securities in an unrealized loss position greater than 12 months | 0 | 0 | 0
Total | (2) | (2) | (8)
Fair Value |  |  |
Securities in an unrealized loss position less than 12 months | 2,899 | 2,899 | 24,211
Securities in an unrealized loss position greater than 12 months | 0 | 0 | 0
Total | 2,899 | 2,899 | $ 24,211
Government obligations |  |  |
Unrealized losses |  |  |
Securities in an unrealized loss position less than 12 months | (16) | (16) |
Securities in an unrealized loss position greater than 12 months | 0 | 0 |
Total | (16) | (16) |
Fair Value |  |  |
Securities in an unrealized loss position less than 12 months | 31,955 | 31,955 |
Securities in an unrealized loss position greater than 12 months | 0 | 0 |
Total | $ 31,955 | $ 31,955 |

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