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Commitments and Contingencies (Details Textuals 1) (Equipment Sale Agreement, USD $)
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9 Months Ended |
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Sep. 30, 2012
Stacks
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Equipment Sale Agreement
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| Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] | |
| Number of fuel cell stacks purchased | 2,347 |
| Total number of fuel cell stacks committed to purchase | 3,250 |
| Amount committed to Ballard fuel cell stacks | $ 9,400,000 |
| Remaining commitment to Ballard | 2,200,000 |
| One-time non-recurring engineering fee | $ 450,000 |
| Non-recurring engineering fee amortized to research and development expense | 18 months |