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Stockholders' Equity - Stock and Warrant Issuances - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2016
Jul. 31, 2015
Feb. 28, 2015
Oct. 31, 2013
Mar. 31, 2016
Sep. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Jun. 13, 2016
Dec. 31, 2015
Oct. 20, 2015
Dec. 31, 2014
Class Of Warrant Or Right [Line Items]                        
Sale of common stock, net of expenses (in shares) 1,215 1,715 440 234                
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                
Number of warrants outstanding (in shares)             7,216,020     1,128,688   53,134
Term period for warrants             5 years          
Sale of units to underwriter   1,715                    
Proceeds of common stock issued, net of related expenses   $ 6,000,000                    
Senior Secured Convertible Notes [Member]                        
Class Of Warrant Or Right [Line Items]                        
Debt instrument, principal face amount           $ 11,437,000 $ 34,351,000 $ 35,000,000 $ 35,000,000      
Scenario, Previously Reported [Member]                        
Class Of Warrant Or Right [Line Items]                        
Sale of common stock, net of expenses (in shares) 425,000 600,000 153,750 81,875                
Sale of units to underwriter   600,000                    
Maximum [Member]                        
Class Of Warrant Or Right [Line Items]                        
Warrants exercisable per share price (in dollars per share)             $ 112.64     $ 112.64   $ 112.64
Maximum offering and selling of stock and securities that entity make to raise capital                     $ 77,400,000  
Entity public float pursuant to SEC regulations                     $ 75,000,000  
Series A Common Stock Warrants [Member]                        
Class Of Warrant Or Right [Line Items]                        
Warrants exercisable per share price (in dollars per share)           $ 49.00 $ 1.61          
Number of warrants outstanding (in shares)           500 300,000          
Warrants exercised (in shares)             300,000          
Net proceeds from exercise of warrants           $ 15,000 $ 400,000          
Number of warrants converted   1,140     285 285            
Gross proceeds from underwriting offering   $ 7,000,000                    
Warrants expiry period           5 years            
Series A Common Stock Warrants [Member] | Scenario, Previously Reported [Member]                        
Class Of Warrant Or Right [Line Items]                        
Number of warrants converted   400,000                    
Series B Common Stock Warrants [Member]                        
Class Of Warrant Or Right [Line Items]                        
Warrants exercised (in shares)         285   100,000          
Net proceeds from exercise of warrants         $ 0.8   $ 800,000          
Number of warrants converted   1,715                    
Remaining outstanding warrants expired         1,140   400,000          
Warrants expiration date         Jan. 29, 2016   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)       106                
Value of warrants issued       $ 1,900,000                
Warrants exercisable per share price (in dollars per share)           $ 39,424.00 $ 112.64          
Number of warrants outstanding (in shares)           100 36,848          
Term period for warrants           5 years            
2013 Warrants [Member] | Scenario, Previously Reported [Member]                        
Class Of Warrant Or Right [Line Items]                        
Warrants issued (in shares)       37,000                
February 2015 Warrants [Member]                        
Class Of Warrant Or Right [Line Items]                        
Warrants issued (in shares)     197                  
Value of warrants issued     $ 800,000                  
Warrants exercisable per share price (in dollars per share)           $ 49.00 $ 1.61          
Number of warrants outstanding (in shares)           100 30,238          
Term period for warrants           5 years 5 years          
Warrants exercised (in shares)             40,000          
Net proceeds from exercise of warrants             $ 100,000          
February 2015 Warrants [Member] | Scenario, Previously Reported [Member]                        
Class Of Warrant Or Right [Line Items]                        
Warrants issued (in shares)     69,000                  
October 2016 Warrants [Member]                        
Class Of Warrant Or Right [Line Items]                        
Warrants issued (in shares) 425                      
Value of warrants issued $ 300,000                      
Warrants exercisable per share price (in dollars per share)           $ 49.00 $ 1.61          
Number of warrants outstanding (in shares)           200 78,750          
Term period for warrants           5 years 5 years          
Warrants exercised (in shares)             70,000          
Net proceeds from exercise of warrants             $ 100,000          
October 2016 Warrants [Member] | Scenario, Previously Reported [Member]                        
Class Of Warrant Or Right [Line Items]                        
Warrants issued (in shares) 148,750                      
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