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Other Current Liabilities (Details) (USD $)
|
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Mar. 31, 2012
|
|
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UTCP
|
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| Other Current Liabilities | |||||
| Capacity of microturbine (in kW) | 200 | ||||
| Cash contribution | $ 12,000,000 | ||||
| In-kind services contribution | 800,000 | ||||
| Royalty payable (as a percent) | 10.00% | ||||
| Royalty payable after recovery of cash and in-kind services (as a percent) | 5.00% | ||||
|
Carrier
|
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| Other Current Liabilities | |||||
| Reduction in predetermined fixed rate royalty (as a percent) | 50.00% | ||||
| Royalties earned | 900,000 | 900,000 | 2,900,000 | 2,200,000 | |
| Unpaid earned royalties | $ 900,000 | $ 1,000,000 | |||