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Summary of significant accounting policies - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Operating lease ROU asset | $ 10,387 |  | $ 11,300 |  |
Allowance for doubtful accounts receivable | 500 |  |  | $ 700 |
Deferred tax liability | 122,032 |  |  | 122,032 |
Retained earnings (accumulated deficit) | (1,052,825) |  |  | $ (938,923) |
ASC 606 Adjustment | $ 0 | $ (3,937) |  |  |
Adjustments |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Retained earnings (accumulated deficit) |  |  |  |  | $ 3,300

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