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Subsequent Events (Details)
 12 Months Ended
Mar. 22, 2018
USD ($)
ft²
Feb. 16, 2018
USD ($)
$ / shares
shares
Jan. 11, 2018
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
May 31, 2016
$ / shares
shares
Subsequent Event [Line Items]            
Number of shares, granted | shares       835,000 460,000  
Options issued, exercise price (in dollars per share) | $ / shares       $ 2.42 $ 5.83  
Warrants to purchase common stock | shares           107,802
Warrants, exercise price (in dollars per share) | $ / shares           $ 7.50
Subsequent Event            
Subsequent Event [Line Items]            
Gross proceeds received from sale of shares and warrants | $   $ 9,000,000        
Exercisable period, subject to beneficial ownership limitations   6 months        
Warrants exercisable period   5 years        
Warrants, exercise price (in dollars per share) | $ / shares   $ 2.80        
Net proceeds from sale of shares and warrants | $   $ 8,270,000        
Right of first refusal period (in months)   9 months        
Tail fee period (in months)   6 months        
Science Advisory Board Member | Subsequent Event            
Subsequent Event [Line Items]            
Number of shares, granted | shares     10,000      
Options issued, exercise price (in dollars per share) | $ / shares     $ 1.89      
IPX Memorial Drive Investors, LLC | Lease Agreement For Corporate Office Space | Subsequent Event            
Subsequent Event [Line Items]            
Rentable square feet | ft² 2,333          
Lease agreement, initial term 66 months          
Lease agreement, renewal period (in years) 5 years          
Base monthly rent | $ $ 4,300          
Annual increase in rent expense (as a percent) 3.00%          
Placement Agency Agreement | Subsequent Event            
Subsequent Event [Line Items]            
Commission payment to agents (as a percent)   6.50%        
Warrants granted to purchase common stock, percentage   3.00%        
Reimbursement of expenses | $   $ 75,000        
Common Stock | Subsequent Event            
Subsequent Event [Line Items]            
Warrants to purchase common stock | shares   2,145,000        
Common Stock | Securities Purchase Agreement | Subsequent Event            
Subsequent Event [Line Items]            
Shares of common stock sold | shares   4,290,000        
Price per share of common stock issued (in dollars per share) | $ / shares   $ 2.10        
Employee Stock Option | Science Advisory Board Member | Subsequent Event            
Subsequent Event [Line Items]            
Options issued, vesting period (in years)     3 years