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Liquidity and Management's Plans - Additional Information (Details) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended
Jul. 18, 2017
Jun. 30, 2017
Jun. 28, 2017
Jun. 30, 2017
May 31, 2017
Sep. 30, 2016
Jun. 30, 2016
May 31, 2016
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Jul. 31, 2017
Conversion Of Stock [Line Items]                          
Net proceeds from sale of common stock                     $ 3,426,050 $ 0  
Proceeds from issuance of private placement net                 $ 9,500,000   $ 0 $ 9,460,749  
May 2016 Warrant [Member]                          
Conversion Of Stock [Line Items]                          
Class of warrant or right, exercise price of warrants or rights         $ 1.3125     $ 1.3125          
Warrant expiration period         5 years     5 years          
Expiration date of warrants issued                     May 18, 2021    
June 2016 Warrant [Member]                          
Conversion Of Stock [Line Items]                          
Class of warrant or right, exercise price of warrants or rights   $ 1.3125   $ 1.3125     $ 1.3125   $ 1.3125 $ 1.3125 $ 1.3125 $ 1.3125  
Warrant expiration period       5 years     5 years            
Expiration date of warrants issued                     May 18, 2021    
Private Placement [Member]                          
Conversion Of Stock [Line Items]                          
Class of warrant or right, number of securities called by warrants or rights             6,790,169   6,790,169     6,790,169  
Class of warrant or right, exercise price of warrants or rights             $ 1.14   $ 1.14     $ 1.14  
Proceeds from issuance of private placement net                 $ 9,500,000        
Sale of stock, description of transaction                     (i) one share of common stock and a detachable stock purchase warrant to purchase an additional 0.75 shares of common stock, or (ii) one share of non-voting convertible preferred stock and a detachable stock purchase warrant to purchase an additional 0.75 shares of common stock, at a price of $1.14 per unit.    
July 2017 Public Offering [Member]                          
Conversion Of Stock [Line Items]                          
Sale of stock, description of transaction                     Each unit included one share of common stock and one common warrant to purchase one share of common stock at an exercise price of $0.425 per share. Each pre-funded unit included one pre-funded warrant to purchase one share of common stock for an exercise price of $0.01 per share, and one common warrant to purchase one share of common stock at an exercise price of $0.425 per share.    
Second Amended and Restated MGHIF Financing Agreement [Member]                          
Conversion Of Stock [Line Items]                          
Interest rate     10.00%                    
Maturity date                     Jul. 14, 2017    
Debt instrument, extended maturity date                     Jul. 14, 2018    
Percentage of warrants to purchase common stock shares on outstanding pricnipal and accrued interest on issuance date     20.00%                    
Common Stock [Member]                          
Conversion Of Stock [Line Items]                          
Conversion of stock, shares issued                     2,309,428    
Common Stock [Member] | Private Placement [Member]                          
Conversion Of Stock [Line Items]                          
Stock issued during period, shares, new issues                 6,744,127        
Non-voting Convertible Preferred Stock [Member]                          
Conversion Of Stock [Line Items]                          
Conversion of stock, shares converted                     2,309,428    
Non-voting Convertible Preferred Stock [Member] | Private Placement [Member]                          
Conversion Of Stock [Line Items]                          
Stock issued during period, shares, new issues                 2,309,428        
Bridge Financing Notes [Member]                          
Conversion Of Stock [Line Items]                          
Remaining capacity available under financing   $ 1,000,000   $ 1,000,000           $ 1,000,000 $ 1,000,000    
Subsequent Event [Member] | July 2017 Public Offering [Member]                          
Conversion Of Stock [Line Items]                          
Class of warrant or right, exercise price of warrants or rights $ 0.425                        
Stock issued during period, shares, new issues 18,164,195                        
Net proceeds from sale of common stock and warrants $ 8,700,000                        
Note Purchase Agreement [Member] | Bridge Financing Notes [Member]                          
Conversion Of Stock [Line Items]                          
Interest rate         10.00%                
Maturity date         Sep. 30, 2017                
Remaining capacity available under financing   1,000,000   1,000,000           1,000,000 $ 1,000,000    
Note Purchase Agreement [Member] | Bridge Financing Notes [Member] | Maximum [Member]                          
Conversion Of Stock [Line Items]                          
Aggregate principal amount         $ 1,500,000                
Note Purchase Agreement [Member] | Bridge Financing Note One [Member]                          
Conversion Of Stock [Line Items]                          
Aggregate principal amount         500,000                
Note Purchase Agreement [Member] | Bridge Financing Note Two [Member]                          
Conversion Of Stock [Line Items]                          
Aggregate principal amount         500,000                
Note Purchase Agreement [Member] | Bridge Financing Note Three [Member]                          
Conversion Of Stock [Line Items]                          
Aggregate principal amount         500,000                
Note Purchase Agreement [Member] | Qualified Financing [Member] | Minimum [Member]                          
Conversion Of Stock [Line Items]                          
Net proceeds from equity or debt financing         $ 5,000,000                
Note Purchase Agreement [Member] | Subsequent Event [Member] | Bridge Financing Notes [Member] | Stock Purchase Warrants [Member]                          
Conversion Of Stock [Line Items]                          
Class of warrant or right, number of securities called by warrants or rights                         140,845
Class of warrant or right, exercise price of warrants or rights                         $ 0.78
Note Purchase Agreement [Member] | Subsequent Event [Member] | Bridge Financing Notes [Member] | Warrants [Member]                          
Conversion Of Stock [Line Items]                          
Class of warrant or right, number of securities called by warrants or rights                         158,730
Class of warrant or right, exercise price of warrants or rights                         $ 0.69
Delaware Limited Liability Company [Member] | Note Purchase Agreement [Member] | Bridge Financing Notes [Member]                          
Conversion Of Stock [Line Items]                          
Interest rate         10.00%                
Maturity date                     Sep. 30, 2017    
Remaining capacity available under financing   1,000,000   $ 1,000,000           1,000,000 $ 1,000,000    
Delaware Limited Liability Company [Member] | Note Purchase Agreement [Member] | Bridge Financing Notes [Member] | Maximum [Member]                          
Conversion Of Stock [Line Items]                          
Aggregate principal amount         $ 1,500,000                
Delaware Limited Liability Company [Member] | Note Purchase Agreement [Member] | Bridge Financing Note One [Member]                          
Conversion Of Stock [Line Items]                          
Aggregate principal amount         500,000                
Delaware Limited Liability Company [Member] | Note Purchase Agreement [Member] | Bridge Financing Note Two [Member]                          
Conversion Of Stock [Line Items]                          
Aggregate principal amount         500,000                
Delaware Limited Liability Company [Member] | Note Purchase Agreement [Member] | Bridge Financing Note Three [Member]                          
Conversion Of Stock [Line Items]                          
Aggregate principal amount         $ 500,000                
Delaware Limited Liability Company [Member] | Note Purchase Agreement [Member] | Qualified Financing [Member] | Minimum [Member]                          
Conversion Of Stock [Line Items]                          
Net proceeds from equity or debt financing                     5,000,000    
Delaware Limited Liability Company [Member] | Note Purchase Agreement [Member] | Subsequent Event [Member] | Bridge Financing Notes [Member] | Stock Purchase Warrants [Member]                          
Conversion Of Stock [Line Items]                          
Class of warrant or right, number of securities called by warrants or rights                         140,845
Class of warrant or right, exercise price of warrants or rights                         $ 0.78
Delaware Limited Liability Company [Member] | Note Purchase Agreement [Member] | Subsequent Event [Member] | Bridge Financing Notes [Member] | Warrants [Member]                          
Conversion Of Stock [Line Items]                          
Class of warrant or right, number of securities called by warrants or rights                         158,730
Class of warrant or right, exercise price of warrants or rights                         $ 0.69
Cowen and Company, LLC [Member] | Sales Agreement [Member] | At the Market Offering [Member]                          
Conversion Of Stock [Line Items]                          
Stock issued during period, value, new issues           $ 11,500,000              
Maximum commission percentage on gross proceeds           3.00%              
Net proceeds from sale of common stock   7,800,000               1,300,000 3,400,000    
Gross proceeds from sale of common stock   8,400,000               $ 1,400,000 $ 3,600,000    
Remaining availability under at the market offering   $ 3,100,000       $ 3,100,000              
Cowen and Company, LLC [Member] | Sales Agreement [Member] | Maximum [Member] | At the Market Offering [Member]                          
Conversion Of Stock [Line Items]                          
Aggregate gross proceeds from issuance of common stock           $ 25,000,000              
Cowen and Company, LLC [Member] | Sales Agreement [Member] | Common Stock [Member] | At the Market Offering [Member]                          
Conversion Of Stock [Line Items]                          
Stock issued during period, shares, new issues   7,700,000               2,000,000 4,000,000