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Marketable Securities - Available-for-sale Securities (Details) - USD ($)
$ in Thousands
 7 Months Ended
Sep. 30, 2014
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax   $ 124 $ 117
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax   (73) (57)
Business Acquisition, Pro Forma Net Income (Loss) $ (374)    
Due within one year, Amortized Cost   6,609  
Due within one year, Estimated fair value   6,602  
Due after one year through five years, Amortized Cost   19,959  
Due after one year through five years, Estimated fair value   20,017  
Due after five years through ten years, Amortized Cost   417  
Due after five years through ten years, Estimated fair value   417  
Total available-for-sale securities, Amortized Cost   26,985 26,096
Estimated fair value   27,036 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   91 89
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax   (72) (55)
Total available-for-sale securities, Amortized Cost   21,317 19,804
Estimated fair value   21,336 19,838
Municipal Bonds [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax   33 28
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax   (1) (2)
Total available-for-sale securities, Amortized Cost   5,668 6,292
Estimated fair value   $ 5,700 $ 6,318