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Stockholders' Equity - Additional Information (Details) - USD ($)
 1 Months Ended 6 Months Ended 12 Months Ended
Jun. 29, 2017
Jun. 30, 2016
Feb. 28, 2018
Aug. 31, 2017
Apr. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Class of Stock [Line Items]                
Number of shares issued (in shares)       298,525        
Proceeds from the issuance of common stock           $ 1,795,860 $ 2,920,253  
Leviston                
Class of Stock [Line Items]                
Number of shares issued (in shares)     615,605   777,936      
Value of shares issued     $ 200,000   $ 200,000      
ATM Agreement                
Class of Stock [Line Items]                
Number of shares issued (in shares)           6,429,299   3,292,161.4
Proceeds from the issuance of common stock $ 250,000         $ 1,743,018   $ 2,595,432
ATM Agreement | International Assets Advisory LLC                
Class of Stock [Line Items]                
Aggregate offering price, up to   $ 5,000,000            
Commission paid (as a percent)   2.50%            
ATM Agreement | Leviston                
Class of Stock [Line Items]                
Aggregate offering price, up to         $ 7,250,000.00