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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Number of Options Outstanding    
Outstanding, Beginning of Period (in shares) 40,000  
Granted (in shares) 0  
Expired (in shares) 0  
Outstanding, End of Period (in shares) 40,000 40,000
Exercisable (in shares) 40,000  
Weighted-Average Exercise Price    
Outstanding, Beginning of Period (in dollars per share) $ 4.67  
Granted (in dollars per share) 0.00  
Expired (in dollars per share) 0.00  
Outstanding, End of Period (in dollars per share) 4.67 $ 4.67
Exercisable (in dollars per share) $ 4.67  
Weighted-Average Remaining Contractual Term (in Years)    
Outstanding 9 months 18 days 1 year 3 months 18 days
Exercisable at June 30, 2019 9 months 18 days  
Aggregate Intrinsic Value (in Thousands)    
Outstanding $ 0 $ 0
Exercisable at June 30, 2019 $ 0