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Stockholder's Equity - Common Stock (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 18, 2018
Sep. 27, 2018
Sep. 05, 2018
Sep. 30, 2018
Oct. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Exercise of stock options (in shares)             299,167  
Stock issued during the period (in shares) 11,788              
Sale of stock, consideration received               $ 4,180,000
Proceeds from exercise of options and warrants             $ 2,675,420 34,000
Stock issued during period for services (in shares)   38,166         11,788  
Stock issued during period, value, issued for services             $ 160,906 $ 882,232
Sales commission percentage           3.00%    
Sale of stock, number of shares issued (in shares)               239,270
Sale of stock, gross proceeds               $ 4,310,000
Exercise Price Range, $10.00 to $15.00                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock options exercisable (in shares)             80,000  
Exercise Price, $10.00                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Proceeds from exercise of options and warrants             $ 110,000 $ 34,000
Exercise Price Range, $7.25 to $10.00                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock options exercisable (in shares)               95,000
Public Offering                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Sale of stock, consideration received     $ 13,000,000          
Sale of stock, number of shares issued (in shares)     811,764          
Sale of stock, price per share (in dollars per share)     $ 17.00          
Over-Allotment Option                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Sale of stock, number of shares issued (in shares)     105,882          
Torreya                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Accrued liabilities   $ 100,000            
Minimum | Exercise Price Range, $10.00 to $15.00                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Exercise price of options (in dollars per share)             $ 10.00  
Minimum | Exercise Price Range, $7.25 to $10.00                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Exercise price of options (in dollars per share)               $ 7.25
Maximum | Exercise Price Range, $10.00 to $15.00                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Exercise price of options (in dollars per share)             $ 15.00  
Maximum | Exercise Price Range, $7.25 to $10.00                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Exercise price of options (in dollars per share)               $ 10.00
Common Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Exercise of stock options (in shares)             318,289 50,497
Stock issued during the period (in shares)               1,051,034
Stock issued during period for services (in shares)             11,788 44,664
Stock issued during period, value, issued for services   $ 782,000         $ 12 $ 45
Common Stock | Exercise Price Range, $10.00 to $15.00                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock issued during the period (in shares)             19,122  
Common Stock | Exercise Price, $10.00                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock issued during the period (in shares)             11,000 3,400
Common Stock | Exercise Price Range, $7.25 to $10.00                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock issued during the period (in shares)               50,497
Common Stock | Valour                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock issued during the period (in shares)       160,000 160,000      
Common Stock | Torreya                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock issued during the period (in shares)   6,498            
Warrant | Exercise Price, $10.00                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Price of warrant (in dollars per share)             $ 10.00 $ 10.00