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Other comprehensive income (loss) and accumulated other comprehensive items (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at the beginning of the period $ 156,437 $ 119,583 $ 226,001
Other comprehensive income (loss) before reclassifications (2,507) 5,454 (285)
Amounts reclassified from other comprehensive items 0 0 0
Other comprehensive income (loss) (2,507) 5,454 (285)
Balance at the end of the period 350,727 156,437 119,583
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 22 (203) (589)
Other comprehensive income (loss) before reclassifications 9 225 386
Amounts reclassified from other comprehensive items 0 0 0
Other comprehensive income (loss) 9 225 386
Balance at the end of the period 31 22 (203)
Foreign Currency Translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at the beginning of the period 3,947 (1,282) (611)
Other comprehensive income (loss) before reclassifications (2,516) 5,229 (671)
Amounts reclassified from other comprehensive items 0 0 0
Other comprehensive income (loss) (2,516) 5,229 (671)
Balance at the end of the period 1,431 3,947 (1,282)
Total Accumulated Other Comprehensive Items      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at the beginning of the period 3,969 (1,485) (1,200)
Balance at the end of the period $ 1,462 $ 3,969 $ (1,485)