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Stockholders' Equity - Warrants - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended
Apr. 02, 2017
Oct. 31, 2016
Jul. 31, 2015
Feb. 28, 2015
Oct. 31, 2013
Mar. 31, 2017
Mar. 31, 2016
Jun. 30, 2016
Jun. 06, 2016
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            
Subsequent Event [Member] | Warrant Repurchase Agreements [Member] | Securities Purchase Agreement [Member]                  
Class Of Warrant Or Right [Line Items]                  
Aggregate amount to be paid in exchange for cancellation of warrants $ 7,876,312                
Senior Secured Convertible Notes [Member]                  
Class Of Warrant Or Right [Line Items]                  
Debt instrument, principal face amount           $ 22,143,000   $ 35,000,000  
Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member]                  
Class Of Warrant Or Right [Line Items]                  
Debt instrument, principal face amount                 $ 35,000,000
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)           300,000      
Number of warrants converted     400,000     100,000      
Gross proceeds from underwriting offering     $ 7,000,000            
Warrants expiry period           5 years      
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      
Series C Warrants [Member]                  
Class Of Warrant Or Right [Line Items]                  
Value of warrants issued               $ 27,800,000  
Series C Warrants [Member] | Senior Secured Convertible Notes [Member]                  
Class Of Warrant Or Right [Line Items]                  
Number of warrants converted               6,800,000  
Debt instrument, principal face amount               $ 35,000,000  
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