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Short-term marketable securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | $ 224,442 | $ 239,171
Gross unrealized losses | (2) | (3)
Fair value | 224,440 | 239,168
Cash equivalents | 162,416 | 158,023
Short-term marketable securities | 62,024 | 81,145
Total | 224,440 | 239,168
Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 162,416 | 158,023
Fair value | 162,416 | 158,023
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 33,976 | 47,955
Fair value | 33,976 | 47,955
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 28,050 | 33,193
Gross unrealized losses | (2) | (3)
Fair value | $ 28,048 | $ 33,190

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