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Stockholders' Equity - Issuance of Common Stock (Details) - Restricted Stock
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 02, 2018
director
shares
Mar. 15, 2018
employee
shares
Jul. 03, 2017
director
shares
May 17, 2016
director
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
employee
May 23, 2018
USD ($)
May 25, 2017
USD ($)
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 $ 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