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Other comprehensive income (loss) and accumulated other comprehensive items (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at the beginning of the period $ 119,583 $ 226,001 $ 298,467
Other comprehensive income before reclassifications 5,454 (285) (463)
Amounts reclassified from other comprehensive items 0 0 0
Other comprehensive income 5,454 (285) (463)
Balance at the end of the period 156,437 119,583 226,001
Unrealized Gains/(Losses) On Marketable Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at the beginning of the period (203) (589) (387)
Other comprehensive income before reclassifications 225 386 (202)
Amounts reclassified from other comprehensive items 0 0 0
Other comprehensive income 225 386 (202)
Balance at the end of the period 22 (203) (589)
Foreign Currency Translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at the beginning of the period (1,282) (611) (350)
Other comprehensive income before reclassifications 5,229 (671) (261)
Amounts reclassified from other comprehensive items 0 0 0
Other comprehensive income 5,229 (671) (261)
Balance at the end of the period 3,947 (1,282) (611)
Accumulated other comprehensive (loss) income      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at the beginning of the period (1,485) (1,200) (737)
Balance at the end of the period $ 3,969 $ (1,485) $ (1,200)