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Stockholders' Equity - Common Stock (Details) - USD ($)
1 Months Ended 9 Months Ended
Sep. 27, 2018
Sep. 30, 2018
Oct. 31, 2017
Sep. 30, 2018
Sep. 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)       239,270  
Shares issued, gross consideration received       $ 4,310,000  
Proceeds from issuance of common shares       4,180,000  
Payments of stock issuance costs       400,000  
Additional deferred financing costs   $ 0   $ 0  
Exercise price of warrants (in dollars per share)   $ 10.00   $ 10.00  
Proceeds from issuance of warrants       $ 34,000 $ 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)       1,259,663  
Stock issued upon exercise of options (in shares)       3,400  
Stock issued during period for services (in shares)       38,166  
Cashless exercise of stock options (in shares)       7,063  
Common Stock | Valour          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock newly-issued during the period (in shares)   160,000      
Public Offering          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares issued in transaction (in shares) 811,764        
Proceeds from issuance of common shares $ 13,000,000        
Sale of stock (in dollars per share) $ 17.00        
Over-Allotment Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares issued in transaction (in shares) 105,882