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Subsequent events Line of credit (Details) (USD $)
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6 Months Ended | ||
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Jun. 30, 2013
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Jun. 30, 2013
Chief Executive Officer (John N. Hatsopoulos)
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Mar. 25, 2013
Chief Executive Officer (John N. Hatsopoulos)
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| Subsequent Event [Line Items] | |||
| Maximum borrowing capacity | $ 1,500,000 | $ 1,000,000 | |
| Line of Credit Facility, Maximum Amount Outstanding During Period | $ 650,000 |
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- Definition
Maximum amount borrowed under the credit facility at any time during the period. No definition available.
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- Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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