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Commitments and Contingencies (Details Textuals 1) (Equipment Sale Agreement, USD $)	6 Months Ended
	Jun. 30, 2012 Stacks
Equipment Sale Agreement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of fuel cell stacks purchased	1,884
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	3,700,000
One-time non-recurring engineering fee	$ 450,000
Non-recurring engineering fee amortized to research and development expense	1 year 6 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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