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Demand note payable and convertible debentures - related party (Details) (USD $)
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12 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended | 12 Months Ended | 0 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 0 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 0 Months Ended | |||||||||||||||||||||||||||||||
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Dec. 31, 2013
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Dec. 31, 2012
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May 11, 2009
Ilios
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May 11, 2009
Director and Chief Executive Officer
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May 11, 2009
Director and Chief Executive Officer
Ilios
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Dec. 31, 2013
Michaelson
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Dec. 31, 2010
Michaelson
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Dec. 31, 2012
Demand notes
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Dec. 31, 2013
Demand notes
Minimum
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Dec. 31, 2013
Demand notes
Maximum
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May 11, 2009
Demand notes
Director and Chief Executive Officer
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Oct. 03, 2013
Demand notes
Chief Executive Officer (John N. Hatsopoulos)
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Nov. 30, 2012
Demand notes
Chief Executive Officer (John N. Hatsopoulos)
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Sep. 07, 2011
Demand notes
Chief Executive Officer (John N. Hatsopoulos)
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Sep. 10, 2008
Demand notes
Chief Executive Officer (John N. Hatsopoulos)
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Dec. 31, 2013
Demand notes
Chief Executive Officer (John N. Hatsopoulos)
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Dec. 31, 2012
Demand notes
Chief Executive Officer (John N. Hatsopoulos)
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Oct. 18, 2013
Convertible debentures
Common stock
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Sep. 30, 2012
Convertible debentures
Conversion of principal amount
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Sep. 30, 2012
Convertible debentures
Conversion of accrued interest
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May 11, 2009
Convertible debentures
Director and Chief Executive Officer
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Dec. 31, 2013
Convertible debentures
Director and Chief Executive Officer
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Sep. 24, 2001
Convertible debentures
Director and Chief Executive Officer
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Dec. 31, 2013
Convertible debentures
Director and Chief Executive Officer
Common stock
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Sep. 24, 2011
Convertible debentures
Director and Chief Executive Officer
Common stock
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Sep. 24, 2011
Convertible debentures
Director and Chief Executive Officer
Conversion of accrued interest
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Sep. 24, 2001
Convertible debentures
Member of board of directors
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May 11, 2009
Convertible debentures
Member of board of directors
Conversion of principal amount
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Oct. 18, 2013
Convertible debentures
Member of board of directors
Conversion of accrued interest
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May 11, 2009
Convertible debentures
Member of board of directors
Conversion of accrued interest
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Oct. 18, 2013
Convertible debentures
Member of board of directors
Conversion of accrued interest in 2012
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Sep. 24, 2001
Convertible debentures
Chief Executive Officer (John N. Hatsopoulos)
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May 11, 2009
Convertible debentures
Chief Executive Officer (John N. Hatsopoulos)
Common stock
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May 11, 2009
Convertible debentures
Chief Executive Officer (John N. Hatsopoulos)
Conversion of principal amount
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May 11, 2009
Convertible debentures
Chief Executive Officer (John N. Hatsopoulos)
Conversion of accrued interest
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Dec. 31, 2013
Convertible debentures
Michaelson
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Dec. 31, 2013
Convertible debentures
Michaelson
Common stock
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Dec. 31, 2013
Convertible debentures
Michaelson
Common stock
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Mar. 26, 2014
Subsequent event
Chief Executive Officer (John N. Hatsopoulos)
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Jan. 06, 2014
Subsequent event
Demand notes
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Mar. 25, 2013
Revolving credit facility
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Dec. 31, 2013
Revolving credit facility
Chief Executive Officer (John N. Hatsopoulos)
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Jul. 22, 2013
Revolving credit facility
Chief Executive Officer (John N. Hatsopoulos)
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Mar. 25, 2013
Revolving credit facility
Chief Executive Officer (John N. Hatsopoulos)
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Jan. 06, 2014
Revolving credit facility
Subsequent event
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Jan. 06, 2014
Revolving credit facility
Subsequent event
Chief Executive Officer (John N. Hatsopoulos)
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| Debt Instrument [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||
| Demand notes payable, related party, current | $ 3,000,000 | $ 0 | $ 1,337,500 | $ 1,750,000 | $ 1,300,000 | $ 1,750,000 | ||||||||||||||||||||||||||||||||||||||||
| Interest paid on debt | 55,639 | 0 | 175,311 | 25,347 | ||||||||||||||||||||||||||||||||||||||||||
| Principal amount | 450,000 | 300,000 | 750,000 | 250,000 | 330,000 | 200,000 | 100,000 | |||||||||||||||||||||||||||||||||||||||
| Related party debt, stated interest rate | 5.00% | 6.00% | 6.00% | 6.00% | 6.00% | 5.00% | 6.00% | 4.00% | ||||||||||||||||||||||||||||||||||||||
| Debt term | 3 years | |||||||||||||||||||||||||||||||||||||||||||||
| Accrue rate after occurrence and during continuance | 8.00% | |||||||||||||||||||||||||||||||||||||||||||||
| Accrue rate after occurrence and during continuance on other default | 2.00% | |||||||||||||||||||||||||||||||||||||||||||||
| Debentures accrued interest, first payment from issuance date | 6 years | |||||||||||||||||||||||||||||||||||||||||||||
| Conversion price in usd per share | $ 1.20 | $ 1.20 | $ 1.20 | $ 2.00 | $ 4.50 | $ 3.20 | $ 2.00 | $ 5.40 | ||||||||||||||||||||||||||||||||||||||
| Percentage of principal and interest | 120.00% | |||||||||||||||||||||||||||||||||||||||||||||
| Consecutive trading days | 20 days | |||||||||||||||||||||||||||||||||||||||||||||
| Maximum conversion amount | 150,000 | |||||||||||||||||||||||||||||||||||||||||||||
| Debt issuance cost | 140,433 | |||||||||||||||||||||||||||||||||||||||||||||
| Working capital line of credit with related party | 3,500,000 | 1,055,000 | 1,500,000 | |||||||||||||||||||||||||||||||||||||||||||
| Number of shares of subsidiary common stock sold by the Company | 1,400,000 | 1,400,000.00 | ||||||||||||||||||||||||||||||||||||||||||||
| Subsidiary common stock sold by the Company, price in usd per share | $ 0.50 | $ 0.50 | ||||||||||||||||||||||||||||||||||||||||||||
| Extinguishment of debt, principal amount | 427,432 | 109,033 | ||||||||||||||||||||||||||||||||||||||||||||
| Extinguishment of debt, accrued interest | 163,535 | |||||||||||||||||||||||||||||||||||||||||||||
| Debt conversion, amount converted | 90,967 | 100,000 | 6,100 | 72,959 | 109,033 | 90,967 | 427,432 | 72,567 | 1,000 | |||||||||||||||||||||||||||||||||||||
| Debt conversion, number of shares issued | 75,806 | 85,242 | 1,000,000 | 185.19 | ||||||||||||||||||||||||||||||||||||||||||
| Common stock issuable upon conversion | 970 | 2,161 | 555,556 | |||||||||||||||||||||||||||||||||||||||||||
| Convertible debentures, related party, current | 0 | 90,967 | 4,367 | 6,913 | 3,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Variable rate | 1.50% | |||||||||||||||||||||||||||||||||||||||||||||
| Amount outstanding | $ 1,200,000 | $ 1,200,000 | ||||||||||||||||||||||||||||||||||||||||||||
| Related party ownership percentage | 6.40% | 6.40% | ||||||||||||||||||||||||||||||||||||||||||||