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Stock-Based Compensation (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 12, 2016
May 31, 2014
Dec. 31, 2018
Dec. 31, 2017
Stock-Based Compensation        
Reserved for issuance (in shares)   233,722    
Voting rights of all classes of stock (in percent)   10.00%    
Exercise price for incentive stock options to the percentage of fair market value   110.00%    
Annual increase in the number of shares to the shares of common stock     77,908 77,908
Share-based Compensation     $ 1,658,000 $ 1,608,000
Options        
Stock-Based Compensation        
Annual increase in the number of shares to the percentage of the issued and outstanding common stock   20.00%    
Vesting period (in years)   4 years    
Expiration period (in years)   10 years    
Share-based Compensation     1,488,000 1,303,000
Performance Award        
Stock-Based Compensation        
Vesting period (in years) 5 years      
Share-based Compensation     $ 132,000 $ 132,000