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Long-Term Debt (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Debt instrument    
Total debt $ 12,000 $ 0
Current maturities of long term debt 0 0
Long-term debt 12,000 0
Carrying value    
Carrying values and estimated fair value of outstanding debt    
Total debt, fair value 12,000 0
Level 2 | Fair value    
Carrying values and estimated fair value of outstanding debt    
Total debt, fair value $ 12,000 0
Texas Capital Credit Facility    
Debt instrument    
Debt Instrument, Interest Rate, Effective Percentage 3.18%  
Total debt   $ 0
Long-term debt $ 12,000