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Summary of significant accounting policies - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Retained earnings (accumulated deficit) | $ (830,105) |  | $ (814,108)
ASC 606 Adjustment | (3,937) |  |
Allowance for doubtful accounts receivable | 800 |  | $ 800
Adjustments |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Retained earnings (accumulated deficit) |  | $ 3,300 |
Variable consideration | $ 600 |  |

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