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Stockholders' Equity - Summary of Warrants Outstanding (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Summary of warrants outstanding    
Number of warrants (shares) 0 284,091
Common Stock Warrant Liability $ 0 $ 360,795
March 2013 financing    
Summary of warrants outstanding    
Exercise price ($ per share) $ 3.17  
Expiration Date Sep. 12, 2018  
Number of warrants (shares) 0 284,091
Common Stock Warrant Liability $ 0 $ 360,795