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Stockholders' Equity - Warrants -Additional Information (Details) - USD ($)
 1 Months Ended 9 Months Ended
Jun. 30, 2016
Jul. 31, 2015
Feb. 28, 2015
Oct. 31, 2013
Sep. 30, 2016
Class Of Warrant Or Right [Line Items]          
Sale of common stock, net of expenses (in shares)   600,000 153,750 81,875  
Proceeds from issuance of private placement     $ 2,600,000 $ 7,500,000  
Net proceeds from issuance of private placement     $ 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)         $ 3.90
Number of warrants outstanding (in shares)         500,000
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      
Senior Secured Convertible Notes [Member]          
Class Of Warrant Or Right [Line Items]          
Debt instrument, principal face amount $ 35,000,000       $ 35,000,000
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
Series C Warrants [Member]          
Class Of Warrant Or Right [Line Items]          
Value of warrants issued $ 27,800,000        
Warrants exercisable per share price (in dollars per share)         $ 4.83
Number of warrants outstanding (in shares)         6,800,000
Percentage of increased number of warrant shares issuable upon exercise         75.00%
Description of warrant issued upon exercise         On December 31, 2017, the number of Warrant Shares issuable upon exercise of the Series C Warrants will be increased by such number of Warrant Shares equal to 75% of the difference of (i) the quotient of (A) the product of (x) the exercise price as of the date of issuance (as adjusted for certain events) multiplied by (y) the number of Warrant Shares as of the date of issuance (as adjusted for certain events), divided by (B) the volume-weighted average price of the Common Stock on the maturity date, less (ii) the number of Warrant Shares as of the date of issuance (as adjusted for certain events).
Warrants holding period 1 year        
Warrants exercisable period 5 years        
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        
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)         $ 3.90
Number of warrants outstanding (in shares)         69,000
Term period for warrants         5 years