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Other comprehensive income (loss) and accumulated other comprehensive items - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019
Other comprehensive income (loss) and accumulated other comprehensive items |  |
Balance at the beginning of the period | $ 512,942 | $ 350,727
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications | 1,117 | 460
Amounts reclassified from other comprehensive items | 0 | 0
Other comprehensive income (loss) | 1,117 | 460
Balance at the end of the period | 488,685 | 488,685
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 | 90 | 31
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications | 839 | 898
Amounts reclassified from other comprehensive items | 0 | 0
Other comprehensive income (loss) | 839 | 898
Balance at the end of the period | 929 | 929
Foreign Currency Translation |  |
Other comprehensive income (loss) and accumulated other comprehensive items |  |
Balance at the beginning of the period | 715 | 1,431
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications | 278 | (438)
Amounts reclassified from other comprehensive items | 0 | 0
Other comprehensive income (loss) | 278 | (438)
Balance at the end of the period | 993 | 993
AOCI Attributable to Parent |  |
Other comprehensive income (loss) and accumulated other comprehensive items |  |
Balance at the beginning of the period | 805 | 1,462
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at the end of the period | $ 1,922 | $ 1,922

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