Commitments and Contingencies - Other Commitments (Details) - Research, development and testing of a more efficient microturbine Combined Heat and Power (CHP) system - USD ($) $ in Millions |
1 Months Ended | |
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Sep. 30, 2010 |
Jun. 30, 2016 |
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| Commitments and Contingencies | ||
| Projected cost of research, development and testing project | $ 11.7 | |
| Contribution by DOE | 5.0 | |
| Expense to be incurred by the company in research and development | $ 6.7 | |
| Cumulative amount of bill under contract | $ 4.2 | |
| DOE | ||
| Commitments and Contingencies | ||
| Term of contract | 5 years |
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