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Fair value measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021 | Nov. 24, 2020 | Apr. 12, 2017
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash | $ 128,800 | $ 217,800 |  |
Marketable securities | 131,619 | 137,830 |  |
Restricted Cash | 0 | 0 |  |
Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents | 88,344 | 183,304 |  |
Marketable securities | 131,619 | 137,830 |  |
Fair Value, Recurring [Member] | Money Market Funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents | 88,344 | 183,304 |  |
Fair Value, Recurring [Member] | Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents | 88,344 | 183,304 |  |
Marketable securities | 0 | 0 |  |
Fair Value, Recurring [Member] | Level 1 [Member] | Money Market Funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents | 88,344 | 183,304 |  |
Fair Value, Recurring [Member] | Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents | 0 | 0 |  |
Marketable securities | 131,619 | 137,830 |  |
Fair Value, Recurring [Member] | Level 2 [Member] | Money Market Funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents | 0 | 0 |  |
Convertible Senior Notes due 2022 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt Instrument |  |  |  | $ 175,000
Convertible Senior Notes due 2022 [Member] | Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of convertible senior notes |  | 132,400 |  |
Convertible Senior Notes due 2025 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt Instrument |  |  | $ 143,800 |
Convertible Senior Notes due 2025 [Member] | Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair value of convertible senior notes | 128,800 | 189,000 |  |
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities | 21,000 | 41,108 |  |
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities | 0 | 0 |  |
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities | 21,000 | 41,108 |  |
Commercial Paper | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities | 68,710 | 72,323 |  |
Commercial Paper | Fair Value, Recurring [Member] | Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities | 0 | 0 |  |
Commercial Paper | Fair Value, Recurring [Member] | Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities | 68,710 | 72,323 |  |
US Government Debt Securities [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities | 41,909 | 24,399 |  |
US Government Debt Securities [Member] | Fair Value, Recurring [Member] | Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities | 0 | 0 |  |
US Government Debt Securities [Member] | Fair Value, Recurring [Member] | Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities | $ 41,909 | $ 24,399 |  |

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