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Summary of Significant Accounting Policies - Project Assets (Details) (USD $)
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Accounting Policies [Abstract] | |||
| Interest costs capitalized | $ 1,824,941 | $ 2,104,206 | $ 442,699 |
| Proceeds from government grants | 3,262,463 | 6,023,767 | 6,695,711 |
| Grant awards and rebates received on project assets | 3,262,463 | 7,310,767 | 6,695,711 |
| Deferred grant income | 8,163,368 | 7,590,730 | |
| Rebates from utility company | $ 1,287,000 | ||
| X | ||||||||||
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- Definition
Proceeds from Government Grants No definition available.
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| X | ||||||||||
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- Definition
Proceeds from Government Grants and Rebates Received on Project Assets No definition available.
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- Definition
Rebates from Utility Company No definition available.
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- Details
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| X | ||||||||||
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- Definition
Amount of interest capitalized during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount as of the balance sheet date of unearned revenue or income not otherwise specified in the taxonomy which is expected to be taken into income after one year or beyond the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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