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Equity - Narrative (Details)
 1 Months Ended 4 Months Ended 12 Months Ended
Sep. 15, 2017
USD ($)
Jul. 29, 2017
warrant
$ / shares
shares
Feb. 21, 2017
USD ($)
Jun. 20, 2016
USD ($)
shares
May 31, 2016
USD ($)
$ / shares
shares
Feb. 28, 2017
USD ($)
$ / shares
shares
Jan. 31, 2017
shares
Oct. 31, 2016
shares
May 02, 2016
USD ($)
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Feb. 09, 2017
$ / shares
Apr. 22, 2016
shares
Class of Stock [Line Items]                          
Shares authorized                 80,000,000        
Preferred stock, shares authorized                 5,000,000 5,000,000 5,000,000    
Common stock, shares authorized                 75,000,000 75,000,000 75,000,000    
Preferred stock, shares issued                   0 0    
Shares issued, price per share (in dollars per share) | $ / shares                   $ 1.35 $ 3.00    
Proceeds from issuance, IPO | $                   $ 6,071,000 $ 9,170,000    
Shares of common stock issued                 234,297        
Warrants to purchase common stock         107,802                
Warrants exercisable period         5 years                
Warrants, exercise price (in dollars per share) | $ / shares         $ 7.50                
Volatility (as a percent)                   80.00%      
Value of cash subscriptions to be received | $                 $ 702,894        
Aggregate fair value of options granted | $                   $ 1,400,000      
Unrecognized compensation cost, net of estimated forfeitures | $                   $ 2,500,000      
Compensation cost recognized, weighted average period (in years)                   8 years 8 months 12 days      
Aggregate fair value of options | $                   $ 3,100,000 $ 1,800,000    
Options exercised                   0 0    
Number of shares cancelled                   0 150,000    
Maximum                          
Class of Stock [Line Items]                          
Shares issued, price per share (in dollars per share) | $ / shares                       $ 1.50  
Expected life (in years)                   6 years 3 months 6 years 3 months    
Volatility (as a percent)                     70.44%    
Minimum                          
Class of Stock [Line Items]                          
Shares issued, price per share (in dollars per share) | $ / shares                       $ 1.35  
Expected life (in years)                   5 years 6 years    
Volatility (as a percent)                     70.18%    
PCG Advisory Group                          
Class of Stock [Line Items]                          
Shares of common stock issued       24,000                  
Value of cash subscriptions to be received | $       $ 157,680                  
Warrant                          
Class of Stock [Line Items]                          
Fair value of warrants | $         $ 374,763                
Discount rate         1.39%                
Expected life (in years)         5 years                
Volatility (as a percent)         80.61%                
Expected dividends | $         $ 0                
GSK Consulting Agreement Warrant One                          
Class of Stock [Line Items]                          
Warrants to purchase common stock   100,000                      
Warrants, exercise price (in dollars per share) | $ / shares   $ 2.41                      
Number of warrants issued | warrant   2                      
GSK Consulting Agreement Warrant Two                          
Class of Stock [Line Items]                          
Warrants to purchase common stock   50,000                      
Warrants, exercise price (in dollars per share) | $ / shares   $ 3.00                      
The Warrants                          
Class of Stock [Line Items]                          
Agreement period   12 months                      
Warrant vesting period (in months)   12 months                      
Expiration period of warrants   5 years                      
Stock compensation expense for non-employee consulting agreement | $                   $ 104,000      
IPO                          
Class of Stock [Line Items]                          
Number of units issued           3,710,000              
Shares issued, price per share (in dollars per share) | $ / shares         $ 6.00 $ 1.35              
Proceeds from issuance, IPO | $         $ 8,464,183 $ 4,500,000              
Shares of common stock issued         1,540,026                
At Market Issuance Sales Agreement                          
Class of Stock [Line Items]                          
Commission payment to agents (as a percent) 3.00%                        
Proceeds from issuance of common stock | $                   $ 1,600,000      
2015 Stock Plan                          
Class of Stock [Line Items]                          
Total number of underlying shares under 2015 Stock Plan                         2,500,000
Common Stock                          
Class of Stock [Line Items]                          
Shares of common stock issued for services                   79,167 24,000    
Common Stock | At Market Issuance Sales Agreement                          
Class of Stock [Line Items]                          
Shares of common stock sold                   776,016      
Common Stock | At Market Issuance Sales Agreement | Maximum                          
Class of Stock [Line Items]                          
Shares issued, price per share (in dollars per share) | $ / shares                   $ 2.71      
Common Stock | At Market Issuance Sales Agreement | Minimum                          
Class of Stock [Line Items]                          
Shares issued, price per share (in dollars per share) | $ / shares                   $ 2.05      
Common Stock | Chief Financial Officer                          
Class of Stock [Line Items]                          
Number of shares cancelled               150,000          
Number of remaining options accelerated for vesting               50,000          
Common Stock | Roth Capital Partners, LLC and National Securities Corporation | At Market Issuance Sales Agreement | Maximum                          
Class of Stock [Line Items]                          
Aggregate price of shares issued | $ $ 13,000,000                        
Former Science Advisory Board                          
Class of Stock [Line Items]                          
Shares of common stock issued for services             79,167            
Gain on settlement of liability | $     $ 150,000                    
Obligation recorded from settlement of liability | $                     $ 240,000