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Demand note payable, convertible debentures and line of credit agreement to related parties (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 01, 2016
USD ($)
$ / shares
shares
Dec. 31, 2013
Jun. 30, 2016
USD ($)
Dec. 31, 2015
shares
Mar. 31, 2016
$ / shares
Jun. 15, 2015
USD ($)
Dec. 23, 2013
USD ($)
Convertible debentures | Michaelson Capital Special Finance Fund LP.              
Debt Instrument [Line Items]              
Convertible debentures, related party, current $ 3,150,000           $ 3,000,000
Related party debt, stated interest rate   4.00%          
Debt Instrument, Term   3 years          
Debt Instrument, Convertible, Accrue Rate After Occurrence and During Continuance   8.00%          
Debt Instrument, Convertible, Accrue Rate After Occurrence and During Continuance, Other Default   2.00%          
Increase to related party convertible debenture $ 150,000            
Debt conversion, amount converted     $ 1,000        
Conversion price in usd per share | $ / shares $ 3.54       $ 3.37    
Debt Instrument, Convertible, Threshold Consecutive Trading Days     20 days        
Debt Instrument, Convertible, If-converted Value in Excess of Principal     $ 150,000        
Debt Instrument, Repurchase, Percentage of Principal and Interest     120.00%        
Convertible debentures | Michaelson Capital Special Finance Fund LP. | Common Stock              
Debt Instrument [Line Items]              
Debt conversion, number of shares issued | shares 282.49            
Common stock issuable upon conversion (shares) | shares       890,207      
Convertible debentures | Management              
Debt Instrument [Line Items]              
Related party debt, stated interest rate     6.00%        
Line of Credit | Chief Executive Officer (John N. Hatsopoulos)              
Debt Instrument [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity           $ 2,000,000  
Line Of Credit Facility, Maximum Withdrawal Limit Per Financial Calendar Quarter           $ 250,000