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Subsequent Events - Additional Information (Detail)
$ / shares in Units, $ in Thousands
Feb. 12, 2016
USD ($)
Subsidiaries
$ / shares
shares
Feb. 11, 2014
$ / shares
Feb. 02, 2016
$ / shares
Jan. 01, 2016
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Jun. 30, 2015
$ / shares
shares
Subsequent Event [Line Items]            
Convertible preferred stock, par or stated value per share (in dollars per share) | $ / shares         $ 0.000001 $ 0.000001
Average exercise price | $ / shares   $ 0.002        
Preferred stock issued         4,600,000,000 4,600,000,000
Subsequent Event [Member]            
Subsequent Event [Line Items]            
Warrants to purchase series B preferred stock 3,403,367     295,945,000    
Average exercise price | $ / shares $ 1.01          
Series A preferred stock conversion to series B preferred stock 297,468          
Common stock reversal split 297,468          
Equity split to number of subsidiaries | Subsidiaries 29          
Subsequent Event [Member] | Predecessor Warrants [Member]            
Subsequent Event [Line Items]            
Warrants issued 295,945          
Subsequent Event [Member] | Placement Agent Warrants [Member]            
Subsequent Event [Line Items]            
Warrants issued 295,945          
Subsequent Event [Member] | Protagenic Therapeutics Inc [Member]            
Subsequent Event [Line Items]            
Common stock to series B preferred stock ratio 1          
Conversion of warrants to purchase series B preferred stock ratio 1          
Subsequent Event [Member] | Series B Preferred Stock [Member]            
Subsequent Event [Line Items]            
Convertible preferred stock, par or stated value per share (in dollars per share) | $ / shares $ 0.000001   $ 0.000001 $ 1.25    
Common stock exchanged for series B preferred stock 6,612,838          
Subsequent Event [Member] | Series B Preferred Stock [Member] | Predecessor Options [Member]            
Subsequent Event [Line Items]            
Preferred stock issued 17,784          
Preferred stock purchase price per share | $ / shares $ 1.25          
Subsequent Event [Member] | Series B Preferred Stock [Member] | Private Placement Offering [Member]            
Subsequent Event [Line Items]            
Preferred stock issued 2,775,000          
Preferred stock purchase price per share | $ / shares $ 1.25          
Preferred stock issued at consideration | $ $ 3,468          
Two Thousand and Six Plan [Member] | Subsequent Event [Member]            
Subsequent Event [Line Items]            
Options to purchase series B preferred stock 1,707,744          
Average exercise price | $ / shares $ 0.66          
Two Thousand and Six Plan [Member] | Subsequent Event [Member] | Protagenic Therapeutics Inc [Member]            
Subsequent Event [Line Items]            
Conversion of options to purchase series B preferred stock ratio 1