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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Sep. 26, 2016
Jun. 15, 2016
Apr. 14, 2016
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 25, 2016
Jun. 16, 2016
Jan. 30, 2015
Class Of Stock [Line Items]                    
Common stock purchase price     $ 3.99              
Aggregate payment of Placement agent, escrow agents and legal fees     $ 1,800              
Additional issued units       334,169            
Placement fees         $ 0 $ 0 $ 3,733      
Warrants outstanding   1,002,507                
M.M. Dillon & Co. Group [Member]                    
Class Of Stock [Line Items]                    
Warrant to purchase stock, shares     100,000              
Placement fees     $ 200              
Majority Shareholder [Member] | Allenex [Member]                    
Class Of Stock [Line Items]                    
Number of common stock purchased       1,002,507            
Shares of common stock subject to outstanding common stock warrants [Member]                    
Class Of Stock [Line Items]                    
Proceeds from issuance of private placement offer     3,000   1,700          
Warrant to purchase stock, shares                 200,000  
Common Stock [Member]                    
Class Of Stock [Line Items]                    
Common stock shares issued             510,777      
Proceeds from issuance of private placement offer     1,900   $ 1,000          
Warrant to purchase stock, shares                   34,483
Warrants outstanding         3,259,926          
Exercise Price                   $ 6.96
Series A Preferred Stock                    
Class Of Stock [Line Items]                    
Proceeds from issuance of private placement offer     $ 9,300   $ 5,300          
Preferred shares convertible to common stock         1,670,845          
Convertible preferred stock shares issued upon conversion                 1  
Private Placement [Member]                    
Class Of Stock [Line Items]                    
Securities purchase agreement private placement units description         On April 14, 2016, the Company completed the sale of 591,860 units (“Units”) to certain accredited investors (the “Private Placement”) at a purchase price of $23.94 per Unit. Each Unit was comprised of (i) one share of the Company’s common stock, (ii) five shares of Series A Mandatorily Convertible Preferred Stock (“Series A Preferred”), and (iii) three warrants, each to purchase one share of the Company’s common stock.          
Common stock shares issued     591,860              
Common stock offer price per share     $ 23.94              
Proceeds from issuance of private placement offer   $ 8,000 $ 14,200              
Placement fees     $ 1,100              
Warrants outstanding 1,775,580   1,975,580              
Exercise Price $ 4.00             $ 4.98    
Public Offering [Member]                    
Class Of Stock [Line Items]                    
Common stock shares issued 2,250,000                  
Common stock offer price per share $ 4.00                  
Gross proceeds from common stock shares issued at public offering $ 9,000                  
Net proceeds from common stock shares issued at public offering 7,800                  
Public Offering [Member] | Allenex [Member]                    
Class Of Stock [Line Items]                    
Gross proceeds from common stock shares issued at public offering $ 9,000                  
Subsequent Financing [Member]                    
Class Of Stock [Line Items]                    
Warrants outstanding 1,002,507                  
Exercise Price $ 4.00             4.98    
Subsequent Financing [Member] | Common Stock [Member]                    
Class Of Stock [Line Items]                    
Exercise Price $ 4.00             $ 4.98