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Development Contracts - Additional Information (Details) (USD $)
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1 Months Ended | 3 Months Ended | 9 Months Ended | 78 Months Ended | 1 Months Ended | 73 Months Ended | 78 Months Ended | 80 Months Ended | 1 Months Ended | 73 Months Ended | 80 Months Ended | 1 Months Ended | ||||||
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Feb. 28, 2007
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Dec. 31, 2011
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Dec. 31, 2009
Award 1
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Oct. 31, 2007
Award 1
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Apr. 16, 2012
Unreimbursed Amount under Awards 1 and 2
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Sep. 30, 2012
Unreimbursed Amount under Awards 1 and 2
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Dec. 10, 2012
Unreimbursed Amount under Awards 1 and 2
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Feb. 28, 2007
Department Of Energy
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Apr. 16, 2012
Reimbursements received under Department of Energy Awards 1 and 2
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Dec. 10, 2012
Reimbursements received under Department of Energy Awards 1 and 2
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Dec. 31, 2009
Fulton Project
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Oct. 31, 2009
Fulton Project
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Dec. 31, 2009
Fulton Project
Award 2
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| Research And Development Arrangement Contract To Perform For Others [Line Items] | ||||||||||||||||||
| Grant awarded by Department of Energy | $ 40,000,000 | $ 7,000,000 | $ 10,000,000 | $ 9,243,984 | $ 10,149,000 | $ 88,000,000 | $ 3,841,000 | $ 81,000,000 | ||||||||||
| Award, cost sharing percentage | 60.00% | 40.00% | ||||||||||||||||
| Total grant available to Entity under awards | 87,560,000 | |||||||||||||||||
| Project development | 129,000 | 158,000 | 420,000 | 429,000 | 14,883,000 | 78,316,000 | 0 | 77,411,000 | ||||||||||
| Overpayment from the cumulative reimbursements of DOE grants under Award 1 | $ 354,000 | $ 354,000 | $ 354,000 | $ 366,000 | ||||||||||||||