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Fair Value of Financial Assets (Schedule of Financial Assets Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Short-term investments $ 50,370 $ 30,731
Other asset – advance payment to supplier 1,728 1,472
Total 52,098 32,203
Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Short-term investments 50,370 30,731
Total 50,370 30,731
Level 3    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other asset – advance payment to supplier 1,728 1,472
Total $ 1,728 $ 1,472