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Demand note payable and convertible debentures - related party (Details) (USD $)
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12 Months Ended | 3 Months Ended | 0 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
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Dec. 31, 2013
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Mar. 26, 2014
Chief Executive Officer (John N. Hatsopoulos)
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Mar. 25, 2013
Chief Executive Officer (John N. Hatsopoulos)
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Dec. 31, 2010
Michaelson Capital Special Finance Fund LP. [Member]
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Jan. 06, 2014
Demand notes
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Mar. 31, 2014
Demand notes
Minimum
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Mar. 31, 2014
Demand notes
Maximum
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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, 2012
Convertible debentures
Common stock
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Dec. 31, 2013
Convertible debentures
Michaelson Capital Special Finance Fund LP. [Member]
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Dec. 31, 2013
Convertible debentures
Michaelson Capital Special Finance Fund LP. [Member]
Common stock
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Dec. 31, 2013
Convertible debentures
Michaelson Capital Special Finance Fund LP. [Member]
Common stock
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Mar. 25, 2013
Revolving Credit Facility [Member]
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Jan. 06, 2014
Revolving Credit Facility [Member]
Chief Executive Officer (John N. Hatsopoulos)
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Mar. 25, 2013
Revolving Credit Facility [Member]
Chief Executive Officer (John N. Hatsopoulos)
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| Debt Instrument [Line Items] | |||||||||||||||||||
| Notes Payable and Line of Credit, Related Parties, Current | $ 0 | $ 2,950,000 | |||||||||||||||||
| Demand notes payable, related party, current | 0 | 3,000,000 | 1,750,000 | ||||||||||||||||
| Related party debt, stated interest rate | 5.00% | 6.00% | 6.00% | 6.00% | 6.00% | 5.00% | 4.00% | ||||||||||||
| Principal amount | 450,000 | 300,000 | 750,000 | 250,000 | |||||||||||||||
| Conversion price in usd per share | $ 5.40 | ||||||||||||||||||
| Maximum borrowing capacity | 3,500,000 | 1,500,000 | 1,500,000 | ||||||||||||||||
| Debt Instrument, Basis Spread on Variable Rate | 1.50% | ||||||||||||||||||
| Debt conversion, amount converted | 1,000 | ||||||||||||||||||
| Debt conversion, number of shares issued | 185.19 | ||||||||||||||||||
| Common stock issuable upon conversion | 555,556 | 555,556 | |||||||||||||||||
| Convertible debentures, related party, current | 3,000,000 | ||||||||||||||||||
| Line of Credit Facility, Amount Outstanding | 1,200,000 | ||||||||||||||||||
| 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 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% | ||||||||||||||||||
| Related party ownership percentage | 6.40% | ||||||||||||||||||
| Debt Issuance Cost | $ 147,577 | ||||||||||||||||||