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Fair value of financial instruments and marketable securities - Unrealized Loss Positions (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months | $ (10) | $ (8)
Securities in an unrealized loss position greater than 12 months | 0 | (3)
Total | (10) | (11)
Fair Value |  |
Securities in an unrealized loss position less than 12 months | 17,684 | 16,223
Securities in an unrealized loss position greater than 12 months | 0 | 10,087
Total | 17,684 | 26,310
Commercial paper |  |
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months | 0 | (1)
Securities in an unrealized loss position greater than 12 months | 0 | 0
Total | 0 | (1)
Fair Value |  |
Securities in an unrealized loss position less than 12 months | 0 | 1,993
Securities in an unrealized loss position greater than 12 months | 0 | 0
Total | 0 | 1,993
Corporate debt securities |  |
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months | (10) | (7)
Securities in an unrealized loss position greater than 12 months | 0 | (3)
Total | (10) | (10)
Fair Value |  |
Securities in an unrealized loss position less than 12 months | 17,684 | 14,230
Securities in an unrealized loss position greater than 12 months | 0 | 10,087
Total | 17,684 | $ 24,317
Asset-backed securities |  |
Unrealized losses |  |
Securities in an unrealized loss position less than 12 months | 0 |
Securities in an unrealized loss position greater than 12 months | 0 |
Total | 0 |
Fair Value |  |
Securities in an unrealized loss position less than 12 months | 0 |
Securities in an unrealized loss position greater than 12 months | 0 |
Total | $ 0 |

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