Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Issued and Outstanding Shares - Additional Information (Detail)

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Common Stock - Issued and Outstanding Shares - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 13 Months Ended
Sep. 30, 2018
Jun. 19, 2018
Jun. 15, 2018
May 22, 2018
Sep. 14, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
May 23, 2018
Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Common stock, par value $ 0.001         $ 0.001   $ 0.001   $ 0.001 $ 0.001 $ 0.001
Exercise price per unit of warrant   $ 4.00                    
Initial purchase of units consisting of common stock and warrants issued               $ 1,280,000 $ 1,129,000      
Common stock, shares issued 4,901,095         4,901,095   4,901,095   4,901,095   1,195,675
Preferred stock, par value $ 0.001         $ 0.001   $ 0.001   $ 0.001   $ 0.001
Warrant exercisable period   5 years                    
Cancellation of warrant description               Additionally, subject to certain exceptions, if, after the June 19, 2018, (i) the volume weighted average price of our common stock for each of 30 consecutive trading days, or the Measurement Period, which Measurement Period commences on June 19, 2018, exceeds 300% of the exercise price (subject to adjustments for stock splits, recapitalizations, stock dividends and similar transactions), (ii) the average daily trading volume for such Measurement Period exceeds $500,000 per trading day and (iii) certain other equity conditions are met, and subject to a beneficial ownership limitation, then we may call for cancellation of all or any portion of the warrants then outstanding.        
Number of required consecutive days weighted average trading price for cancelation or recall of warrants   30 days                    
Minimum required trading price percentage over exercise price for cancelation or recall of warrants   300.00%                    
Minimum required trading volume value per day for cancelation or recall of warrants   $ 500,000                    
Gross proceeds from sale of units               $ 13,800        
Warrant issuance costs               1,600        
Net proceeds from issuance of warrants               $ 12,200        
Preferred stock, shares outstanding 652         652   652   652   0
Stock option exercises, Shares           0 0 0 0      
Restricted stock unit settlements           5,340 5,340 5,340 5,340      
Series A Convertible Preferred Stock [Member]                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Preferred stock, shares converted 8,506                      
Preferred stock, shares outstanding 652         652   652   652    
Series A Convertible Preferred Stock [Member] | Common Stock                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Convertible preferred stock, shares issued upon conversion 2,126,500                      
Class A Units [Member]                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Issuance of new units in a public offering   710,500                    
Public offering, price per unit   $ 4.00                    
Description of stock units issued               Each Class A Unit consisted of one share of our common stock and a warrant to purchase one share of common stock.        
Class B Units [Member]                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Issuance of new units in a public offering   9,158                    
Public offering, price per unit   $ 1,000                    
Description of stock units issued               Each Class B Unit consisted of one share of Series A Convertible Preferred Stock par value $0.001 per share convertible at any time at the holder’s option into 250 shares of common stock and warrants to purchase 250 shares of common stock.        
Number of common shares issuable for each share of convertible preferred stock   250                    
Number of common shares issuable conversion of warrants   250                    
Class B Units [Member] | Series A Convertible Preferred Stock [Member]                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Preferred stock, par value   $ 0.001                    
LPC [Member]                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Common stock value right to sell, maximum         $ 11,000,000              
Common stock, par value         $ 0.001              
Minimum percentage of common stock shares outstanding authorized to sell       20.00%                
Initial purchase of common stock                   32,895    
Common stock, purchase price         $ 1.00              
Additional common stock value right to sell, maximum         $ 10,000,000              
Additional purchase of common stock, maximum         8,000              
Common stock, shares issued         12,352              
Gross proceeds         $ 0              
Common stock, shares issued                   183,378    
Gross proceeds                   $ 3,600,000    
Offering expenses                   500,000    
Common stock available for sale under offering $ 7,400,000         $ 7,400,000   $ 7,400,000   $ 7,400,000    
LPC [Member] | Minimum [Member]                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Common stock, purchase price         $ 20.00              
LPC [Member] | Units [Member]                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Initial purchase of common stock         32,895              
Common stock, purchase price         $ 30.40              
Purchase agreement, description               Unit consisting of (a) one share of our Common Stock and (b) one warrant to purchase one-quarter of a share of Common Stock at an exercise price of $34.96 per share, or Warrant. Each Warrant is exercisable six months following the issuance date until the date that is five years and six months after the issuance date and is subject to customary adjustments.        
Exercise price per unit of warrant         $ 34.96              
Initial purchase of units consisting of common stock and warrants issued         $ 1,000,000              
LPC [Member] | Other Units [Member]                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Number of warrants issued         0              
Ladenburg Thalmann & Co. Inc [Member]                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Period granted for underwriting option     45 days                  
Ladenburg Thalmann & Co. Inc [Member] | Overallotment Option [Member]                        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                        
Additional purchase of common stock and warrants, maximum     450,000                  
Overallotment option exercise date     Jun. 18, 2018