Quarterly report pursuant to Section 13 or 15(d)

Commitments and contingencies - Agreement with Digital Energy Corp. (Details)

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Commitments and contingencies - Agreement with Digital Energy Corp. (Details) (USD $)
Oct. 26, 2011
Financial guarantee
Mar. 31, 2014
Revolving Credit Facility [Member]
Mar. 31, 2014
Chief Executive Officer (John N. Hatsopoulos)
Letter of Credit [Member]
Guarantor Obligations [Line Items]      
Letter of credit outstanding $ 180,000 $ 583,073  
Certificate of deposit securing letter of credit 180,000    
Promissory note receivable amount 180,000    
Promissory note receivable, stated interest rate 6.00%    
Collateralized Financings     $ 1,055,000