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Commitments and Contingencies (Details Textuals 1) (Equipment Sale Agreement, USD $)	9 Months Ended
	Sep. 30, 2012 Stacks
Equipment Sale Agreement
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

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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