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Nature of Operations - Additional Information (Detail)
 3 Months Ended
Apr. 12, 2017
USD ($)
$ / shares
shares
Apr. 03, 2017
USD ($)
shares
Feb. 10, 2017
shares
Mar. 31, 2017
USD ($)
shares
Feb. 02, 2017
shares
Dec. 31, 2016
shares
Organization and Nature of Operations [Line Items]            
Common stock, shares outstanding       1,000,036   801,756
Proceeds from issuance of common stock, net of issuance costs | $       $ 1,782,000    
Capital on Demand Sales Agreement with Jones Trading Institutional Services LLC            
Organization and Nature of Operations [Line Items]            
Issuance of stock, shares       198,280    
Proceeds from issuance of common stock, net of issuance costs | $       $ 1,800,000    
Common Stock            
Organization and Nature of Operations [Line Items]            
Issuance of stock, shares       198,280    
Subsequent Event            
Organization and Nature of Operations [Line Items]            
Proceeds from issuance of common stock, net of issuance costs | $ $ 18,700,000          
Warrants exercise shares 2,070,000          
Warrants exercise price | $ / shares $ 5.50          
Subsequent Event | Capital on Demand Sales Agreement with Jones Trading Institutional Services LLC            
Organization and Nature of Operations [Line Items]            
Issuance of stock, shares   241,600        
Proceeds from issuance of common stock, net of issuance costs | $   $ 3,500,000        
Common stock available for sale | $   $ 0        
Subsequent Event | Common Stock            
Organization and Nature of Operations [Line Items]            
Issuance of stock, shares 1,470,000          
Subsequent Event | Series A Preferred Stock            
Organization and Nature of Operations [Line Items]            
Issuance of stock, shares 13,350          
Conversion of redeemable convertible notes to common stock 200          
Overallotment Option | Subsequent Event            
Organization and Nature of Operations [Line Items]            
Warrants exercise shares 270,000          
Overallotment Option | Subsequent Event | Common Stock            
Organization and Nature of Operations [Line Items]            
Issuance of stock, shares 540,000          
2017 Reverse Stock Split            
Organization and Nature of Operations [Line Items]            
Reverse stock split, description       On February 10, 2017, the Company effected a reverse stock split of its common stock at a ratio of 1-for-15 (“2017 Reverse Stock Split”). The 2017 Reverse Stock Split was approved by the Company’s stockholders at a special meeting of stockholders held on February 2, 2017. As a result of the 2017 Reverse Stock Split, each 15 pre-split shares of common stock outstanding were automatically combined into one new share of common stock, and the number of outstanding shares of common stock on the date of the split was reduced from approximately 13.0 million shares to approximately 868,000 shares.    
Reverse stock split ratio     0.06667      
Common stock, shares outstanding     868,000   13,000,000