The amount of future milestone payments receivable subject to successful completion and acceptance of milestones.

No definition available.

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- Definition

Cash receipts from customers during the current period which are usually for sales of goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 27

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585

+ Details

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Balance Type:	debit
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- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a))

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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- Definition

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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Strategic Partnerships - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended			1 Months Ended	3 Months Ended		9 Months Ended	1 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2011 Toyota RAV4 Program Phase 0 agreement [Member] Maximum [Member]	Oct. 31, 2010 Toyota RAV4 Program Phase 1 contract services agreement [Member]	Mar. 31, 2012 Toyota RAV4 Program Phase 1 contract services agreement [Member]	Sep. 30, 2011 Toyota RAV4 Program Phase 1 contract services agreement [Member]	Sep. 30, 2011 Toyota RAV4 Program Phase 1 contract services agreement [Member]	Oct. 31, 2010 Upfront payment arrangement [Member]	Sep. 30, 2012 Toyota supply and services agreement [Member]	Sep. 30, 2012 Toyota supply and services agreement [Member]	Jun. 30, 2012 Daimler Mercedes-Benz EV Program [Member]
Development services revenue recognized	$ 81,000	$ 14,431,000	$ 15,601,000	$ 48,976,000	$ 7,600,000		$ 10,700,000	$ 14,300,000	$ 40,900,000				$ 4,300,000
Future milestone payments						60,000,000
Aggregate amount of payments received during period										5,000,000
Revenue from automotive sales	$ 50,023,000	$ 43,235,000	$ 91,323,000	$ 115,891,000							$ 10,400,000	$ 15,100,000