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Fair value of financial instruments and marketable securities - Unrealized Loss Positions (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months | $ (2) | $ (28)
Securities in an unrealized loss position greater than 12 months | 0 | 0
Total | (2) | (28)
Fair Value |  |
Securities in an unrealized loss position less than 12 months | 9,196 | 95,990
Securities in an unrealized loss position greater than 12 months | 0 | 0
Total | 9,196 | 95,990
Corporate debt securities |  |
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months |  | (20)
Securities in an unrealized loss position greater than 12 months |  | 0
Total |  | (20)
Fair Value |  |
Securities in an unrealized loss position less than 12 months |  | 71,779
Securities in an unrealized loss position greater than 12 months |  | 0
Total |  | 71,779
Asset-backed securities |  |
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months | (1) | (8)
Securities in an unrealized loss position greater than 12 months | 0 | 0
Total | (1) | (8)
Fair Value |  |
Securities in an unrealized loss position less than 12 months | 594 | 24,211
Securities in an unrealized loss position greater than 12 months | 0 | 0
Total | 594 | $ 24,211
Government obligations |  |
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months | (1) |
Securities in an unrealized loss position greater than 12 months | 0 |
Total | (1) |
Fair Value |  |
Securities in an unrealized loss position less than 12 months | 8,602 |
Securities in an unrealized loss position greater than 12 months | 0 |
Total | $ 8,602 |

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