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Summary of significant accounting policies - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Inventory Write-down | $ 1,600 |  |  |  |  |
Letters of Credit |  | $ 7,500 |  |  |  |
Term for letter of credit (in years) |  | 5 years |  |  |  |
Operating lease ROU asset |  | $ 13,708 |  | $ 11,300 |  |
Allowance for doubtful accounts receivable |  | 300 |  |  | $ 700 |
Deferred tax liability |  |  |  |  | 122,000 |
Retained earnings (accumulated deficit) |  | (1,112,822) |  |  | $ (938,923) |
ASC 606 Adjustment |  | 0 | $ (3,937) |  |  |
Adjustments |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Retained earnings (accumulated deficit) |  |  |  |  |  | $ 3,300
Fifth Anniversary |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Letters of Credit |  | $ 3,800 |  |  |  |

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