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Summary of significant accounting policies - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Allowance for credit loss | $ 0 |  | $ 0 |  |
Inventory write-down |  | $ 0 | 200,000 | $ 0 |
Letters of Credit | 7,500,000 |  | $ 7,500,000 |  |
Term for letter of credit (in years) |  |  | 5 years |  |
Operating lease ROU asset | 29,475,000 |  | $ 29,475,000 |  | $ 13,693,000
Allowance for doubtful accounts receivable | 200,000 |  | 200,000 |  | 300,000
Deferred tax liability |  |  |  |  | $ 122,000,000.0
Accounts receivable, allowance for credit loss, | 0 |  | 0 |  |
Fifth Anniversary |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Letters of Credit | $ 3,800,000 |  | $ 3,800,000 |  |

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