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Marketable Securities - Available-for-sale Securities (Details) - USD ($)
$ in Thousands
 4 Months Ended
Jun. 30, 2014
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax   $ 115 $ 117
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax   (92) (57)
Business Acquisition, Pro Forma Net Income (Loss) $ (163)    
Due within one year, Amortized Cost   6,410  
Due within one year, Estimated fair value   6,384  
Due after one year through five years, Amortized Cost   18,350  
Due after one year through five years, Estimated fair value   18,399  
Due after five years through ten years, Amortized Cost   358  
Due after five years through ten years, Estimated fair value   358  
Total available-for-sale securities, Amortized Cost   25,118 26,096
Estimated fair value   25,141 26,156
Corporate Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax   92 89
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax   (90) (55)
Total available-for-sale securities, Amortized Cost   18,966 19,804
Estimated fair value   18,968 19,838
Municipal Bonds [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax   23 28
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax   (2) (2)
Total available-for-sale securities, Amortized Cost   6,152 6,292
Estimated fair value   $ 6,173 $ 6,318