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Other comprehensive income (loss) and accumulated other comprehensive items (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at the beginning of the period $ (1,200)    
Balance at the end of the period (1,485) $ (1,200)  
Unrealized Gains/(Losses) On Marketable Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at the beginning of the period (589) (387) $ 70
Other comprehensive income (loss) before reclassifications 386 (202) (457)
Amounts reclassified from other comprehensive items 0 0 0
Other comprehensive income (loss) 386 (202) (457)
Balance at the end of the period (203) (589) (387)
Foreign Currency Translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at the beginning of the period (611) (350) 0
Other comprehensive income (loss) before reclassifications (671) (261) (350)
Amounts reclassified from other comprehensive items 0 0 0
Other comprehensive income (loss) (671) (261) (350)
Balance at the end of the period (1,282) (611) (350)
Accumulated other comprehensive income (loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at the beginning of the period (1,200) (737) 70
Other comprehensive income (loss) before reclassifications (285) (463) (807)
Amounts reclassified from other comprehensive items 0 0 0
Other comprehensive income (loss) (285) (463) (807)
Balance at the end of the period $ (1,485) $ (1,200) $ (737)