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Investments in Marketable Securities Available-for sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Aggregate Cost $ 18,790 $ 2,362
Gross Unrealized Gains 20 15
Gross Unrealized Losses (299) 0
Aggregate Market Value 18,511 2,377
Money Market Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Aggregate Cost 13,244 2,212
Gross Unrealized Gains 18 7
Gross Unrealized Losses (179) 0
Aggregate Market Value 13,083 2,219
Time deposit with original maturities more than three months    
Schedule of Available-for-sale Securities [Line Items]    
Aggregate Cost 5,546 150
Gross Unrealized Gains 2 8
Gross Unrealized Losses (120) 0
Aggregate Market Value $ 5,428 $ 158