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Other comprehensive income (loss) and accumulated other comprehensive items - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019
Other comprehensive income (loss) and accumulated other comprehensive items |  |
Balance at the beginning of the period | $ 488,685 | $ 350,727
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications | (1,306) | (846)
Amounts reclassified from other comprehensive items | 0 | 0
Other comprehensive income (loss) | (1,306) | (846)
Balance at the end of the period | 663,654 | 663,654
Unrealized Gains/(Losses) On Marketable Securities, net of tax |  |
Other comprehensive income (loss) and accumulated other comprehensive items |  |
Balance at the beginning of the period | 929 | 31
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications | (463) | 435
Amounts reclassified from other comprehensive items | 0 | 0
Other comprehensive income (loss) | (463) | 435
Balance at the end of the period | 466 | 466
Foreign Currency Translation |  |
Other comprehensive income (loss) and accumulated other comprehensive items |  |
Balance at the beginning of the period | 993 | 1,431
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications | (843) | (1,281)
Amounts reclassified from other comprehensive items | 0 | 0
Other comprehensive income (loss) | (843) | (1,281)
Balance at the end of the period | 150 | 150
AOCI Attributable to Parent |  |
Other comprehensive income (loss) and accumulated other comprehensive items |  |
Balance at the beginning of the period | 1,922 | 1,462
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at the end of the period | $ 616 | $ 616

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