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Stockholders' Equity - Common Stock (Details) - USD ($)
1 Months Ended 6 Months Ended
Oct. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Sales commission percentage 3.00%    
Number of shares issued in transaction (in shares)   128,250  
Shares issued, gross consideration received   $ 2,610,000  
Proceeds from issuance of common shares   2,530,000  
Payments of stock issuance costs   400,000  
Additional deferred financing costs   $ 0  
Exercise price of warrants (in dollars per share)   $ 10.00  
Proceeds from issuance of warrants   $ 24,000 $ 0
Stock issued during period for services   $ 782,000  
Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock newly-issued during the period (in shares)   175,879  
Stock issued upon exercise of options (in shares)   2,400  
Stock issued during period for services (in shares)   38,166  
Cashless exercise of stock options (in shares)   7,063