Quarterly report pursuant to Section 13 or 15(d)

Demand note payable, convertible debentures and line of credit agreement to related parties (Details)

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Demand note payable, convertible debentures and line of credit agreement to related parties (Details)
3 Months Ended 12 Months Ended
Apr. 01, 2016
USD ($)
shares
$ / shares
Mar. 31, 2016
USD ($)
$ / shares
Dec. 31, 2013
Dec. 31, 2015
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           $ 3,000,000
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%      
Debt conversion, amount converted   $ 1,000        
Conversion price in usd per share | $ / shares   $ 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]            
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  
Subsequent Event | Convertible debentures | Michaelson Capital Special Finance Fund LP.            
Debt Instrument [Line Items]            
Convertible debentures, related party, current $ 3,150,000          
Increase to related party convertible debenture $ 150,000          
Conversion price in usd per share | $ / shares $ 3.54          
Subsequent Event | 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 889,830