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Fair value measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Nov. 24, 2020 | Dec. 31, 2019 | Apr. 12, 2017
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash | $ 308,200 |  | $ 145,900 |
Marketable securities | 0 |  | 14,847 |
Restricted Cash | 2,000 |  | 0 |
Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents | 19,445 |  | 4,413 |
Marketable securities | 0 |  | 14,847 |
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 | 19,445 |  | 4,413 |
Fair Value, Recurring [Member] | Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents | 19,445 |  | 4,413 |
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 | 19,445 |  | 4,413 |
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 | 0 |  | 14,847 |
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 | 146,000 |  | 170,000 |
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 | 166,800 |  |  |
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Marketable securities | 0 |  | 14,847 |
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 | $ 0 |  | $ 14,847 |

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