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Stockholders' Equity - Issuance of Common Stock (Details) - Restricted Stock
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 02, 2018
director
shares
May 23, 2018
USD ($)
director
Mar. 15, 2018
employee
shares
Jul. 03, 2017
director
shares
May 17, 2016
director
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
employee
May 25, 2017
USD ($)
Date of issue                    
Share-based compensation                    
Vesting percentage         25.00%          
August 17, 2016                    
Share-based compensation                    
Vesting percentage         25.00%          
November 17, 2016                    
Share-based compensation                    
Vesting percentage         25.00%          
February 17, 2017                    
Share-based compensation                    
Vesting percentage         25.00%          
Directors                    
Share-based compensation                    
Fair value of equity grant award approved for each director   $ 50,000               $ 50,000
Number of restricted stock awards granted | shares 2,778     5,334 8,919          
Number of directors granted restricted stock awards | director 1     2 3          
Number of directors who elected to receive cash in lieu of the stock | director   3   4            
Directors | Maximum                    
Share-based compensation                    
Stock compensation expense           $ 100,000 $ 100,000 $ 100,000    
Officers                    
Share-based compensation                    
Number of restricted stock awards granted | shares     9,956              
Number of directors granted restricted stock awards | employee     4              
Stock compensation expense             $ 200,000      
Percentage of total discretionary cash incentive award elected to be received in shares of Company stock                 50.00%  
Number of grantees who elected to receive a portion of total discretionary cash incentive award in shares of company stock | employee                 4