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Other comprehensive income (loss) and accumulated other comprehensive items (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at the beginning of the period $ 350,727 $ 156,437 $ 119,583
Other comprehensive income (loss) before reclassifications (12,046) (2,507) 5,454
Amounts reclassified from other comprehensive items 0 0 0
Other comprehensive income (loss) (12,046) (2,507) 5,454
Balance at the end of the period 594,330 350,727 156,437
Unrealized (Losses)/Gains On Marketable Securities, net of tax      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at the beginning of the period 31 22 (203)
Other comprehensive income (loss) before reclassifications 724 9 225
Amounts reclassified from other comprehensive items 0 0 0
Other comprehensive income (loss) 724 9 225
Balance at the end of the period 755 31 22
Foreign Currency Translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at the beginning of the period 1,431 3,947 (1,282)
Other comprehensive income (loss) before reclassifications (12,770) (2,516) 5,229
Amounts reclassified from other comprehensive items 0 0 0
Other comprehensive income (loss) (12,770) (2,516) 5,229
Balance at the end of the period (11,339) 1,431 3,947
Total Accumulated Other Comprehensive Items      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at the beginning of the period 1,462 3,969 (1,485)
Balance at the end of the period $ (10,584) $ 1,462 $ 3,969