Annual report pursuant to Section 13 and 15(d)

Financial instruments - Cash Equivalents and Short-term Deposits (Details)

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Financial instruments - Cash Equivalents and Short-term Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financial instruments    
Cash and cash equivalents $ 84,043 $ 158,779
Marketable securities 124,218  
Restricted cash $ 4,253