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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