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Related Party Transactions - Letter of Credit (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]    
Warrants to purchase (in shares) 759,396 1,036,717
Fair value of warrants included in stockholders equity   $ 630,859
Office lease extension agreement    
Related Party Transaction [Line Items]    
Standby letter of credit received as collateral $ 475,000  
Warrants to purchase (in shares) 670,586  
Exercise price (in dollars per share) $ 0.70  
Term 5 years  
Fair value of warrants included in stockholders equity $ 493,688  
Office lease extension agreement | Pacific Capital Management LLC    
Related Party Transaction [Line Items]    
Standby letter of credit received as collateral $ 475,000  
Warrants to purchase (in shares) 670,586  
Exercise price (in dollars per share) $ 0.70  
Term 5 years  
Fair value of warrants included in stockholders equity $ 493,688