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Stockholders' Equity - Warrants - Additional Information (Details) - USD ($)
 1 Months Ended 6 Months Ended
Oct. 31, 2016
Jul. 31, 2015
Feb. 28, 2015
Oct. 31, 2013
Jun. 30, 2017
Class Of Warrant Or Right [Line Items]          
Sale of common stock, net of expenses (in shares) 425,000 600,000 153,750 81,875  
Proceeds from issuance of private placement $ 1,200,000   $ 2,600,000 $ 7,500,000  
Net proceeds from issuance of private placement $ 1,100,000   $ 2,500,000 $ 6,900,000  
Sale of units to underwriter   600,000      
Proceeds of common stock issued, net of related expenses   $ 6,000,000      
Series A Common Stock Warrants [Member]          
Class Of Warrant Or Right [Line Items]          
Warrants exercisable per share price (in dollars per share)         $ 0.14
Number of warrants outstanding (in shares)         200,000
Number of warrants converted   400,000     100,000
Gross proceeds from underwriting offering   $ 7,000,000      
Warrants expiry period         5 years
Warrants exercised (in shares)         100,000
Net proceeds from exercise of warrants         $ 15,000
Series B Common Stock Warrants [Member]          
Class Of Warrant Or Right [Line Items]          
Number of warrants converted   600,000      
Warrants exercised (in shares)         100,000
Net proceeds from exercise of warrants         $ 800,000
Remaining outstanding warrants expired         400,000
Warrants expiration date         Jan. 29, 2016
Series A and B Common Stock Warrants [Member]          
Class Of Warrant Or Right [Line Items]          
Value of warrants issued   $ 3,400,000      
2013 Warrants [Member]          
Class Of Warrant Or Right [Line Items]          
Warrants issued (in shares)       37,000  
Value of warrants issued       $ 1,900,000  
Warrants exercisable per share price (in dollars per share)         $ 112.64
Number of warrants outstanding (in shares)         37,000
Term period for warrants         5 years
February 2015 Warrants [Member]          
Class Of Warrant Or Right [Line Items]          
Warrants issued (in shares)     69,000    
Value of warrants issued     $ 800,000    
Warrants exercisable per share price (in dollars per share)         $ 0.14
Number of warrants outstanding (in shares)         30,000
Term period for warrants         5 years
October 2016 Warrants [Member]          
Class Of Warrant Or Right [Line Items]          
Warrants issued (in shares) 148,750        
Value of warrants issued $ 300,000        
Warrants exercisable per share price (in dollars per share)         $ 0.14
Number of warrants outstanding (in shares)         100,000
Term period for warrants         5 years