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Acquisition (Detail) - USD ($)
3 Months Ended 4 Months Ended 9 Months Ended
May 22, 2017
Jan. 01, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Acquisition                
Common stock, par value     $ 0.01   $ 0.01 $ 0.01   $ 0.01
Conversion of convertible preferred shares to common stock     21,528,000   21,528,000 21,528,000    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                
Goodwill     $ 6,397,671   $ 6,397,671 $ 6,397,671    
Amortization period           3 years    
Results of acquisition         $ (443,000)      
Trademarks/tradenames                
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                
Amortization period           10 years    
Conditional convertible preferred stock                
Acquisition                
Preferred stock, par value     $ 0.01   $ 0.01 $ 0.01   $ 0.01
BarioSurg                
Acquisition                
Conversion of convertible preferred shares to common stock 5,000,000              
Cash consideration $ 2,000,000              
Number of preferred stock deposited with an escrow agent 100,018              
Total consideration $ 28,300,000              
Value of equity consideration $ 26,300,000              
Number of trading days 3 days              
Discount for lack of marketability (in percentage) 19.00%              
Acquisition related cost     $ 131,000     $ 367,000    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                
Cash     151,280   $ 151,280 151,280    
Property and equipment     3,000   3,000 3,000    
Goodwill     6,397,671   6,397,671 6,397,671    
Other assets     5,826   5,826 5,826    
Current liabilities assumed     (186,000)   (186,000) (186,000)    
Net assets acquired     28,258,963   28,258,963 28,258,963    
Business Acquisition, Pro Forma Information [Abstract]                
Sales     360,020 $ 296,760   493,120 $ 644,760  
Net loss     $ (9,895,138) $ (6,691,689)   $ (24,230,493) $ (19,406,642)  
Net loss per share—basic     $ (1.04) $ (3.46)   $ (2.92) $ (11.73)  
BarioSurg | In Process Research & Development                
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                
Intangible assets     $ 20,720,939   20,720,939 $ 20,720,939    
BarioSurg | Trademarks/tradenames                
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                
Intangible assets     1,090,363   1,090,363 1,090,363    
BarioSurg | Covenant not to compete                
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]                
Intangible assets     $ 75,884   $ 75,884 $ 75,884    
BarioSurg | Common Stock                
Acquisition                
Number of shares issued 1,380,000 1,380,000            
Common stock, par value $ 0.01              
BarioSurg | Conditional convertible preferred stock                
Acquisition                
Number of shares issued 1,000,000              
Preferred stock, par value $ 0.01              
Conversion of convertible preferred shares to common stock 5,000,905