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Fair Value of Financial Assets and Liabilities (Details) - Recurring basis - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Level 1    
ASSETS    
Cash equivalents $ 11,188 $ 11,953
Total assets 11,188 11,953
Level 2    
ASSETS    
Cash equivalents
Total assets
Level 3    
ASSETS    
Cash equivalents
Total assets
Total    
ASSETS    
Cash equivalents 11,188 11,953
Total assets $ 11,188 $ 11,953