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Stockholders' Equity - Reconciliation of Transactions Under ATM Agreement (Details) - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended
Jun. 29, 2017
Aug. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Class of Stock [Line Items]          
Number of shares sold (in shares)   298,525      
Net proceeds     $ 1,795,860 $ 2,920,253  
ATM Agreement          
Class of Stock [Line Items]          
Number of shares sold (in shares)     6,429,299   3,292,161.4
Gross proceeds     $ 1,795,860   $ 2,670,253
Fees     52,842   74,821
Net proceeds $ 250,000   $ 1,743,018   $ 2,595,432
Average price per share (in dollars per share)     $ 0.28   $ 0.81