Condensed Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues
Automotive sales	$ 50,023	$ 43,235	$ 91,323	$ 115,891
Development services	81	14,431	15,601	48,976
Total revenues	50,104	57,666	106,924	164,867
Cost of revenues
Automotive sales	58,865	32,752	92,947	90,241
Development services		7,690	7,767	20,866
Total cost of revenues	58,865	40,442	100,714	111,107
Gross profit (loss)	(8,761)	17,224	6,210	53,760
Operating expenses
Research and development	61,901	54,083	205,146	147,776
Selling, general and administrative	37,798	27,618	104,464	76,545
Total operating expenses	99,699	81,701	309,610	224,321
Loss from operations	(108,460)	(64,477)	(303,400)	(170,561)
Interest income	38	80	203	166
Interest expense	(78)		(228)
Other expense, net	(2,188)	(594)	(2,573)	(2,150)
Loss before income taxes	(110,688)	(64,991)	(305,998)	(172,545)
Provision for income taxes	116	87	284	377
Net loss	$ (110,804)	$ (65,078)	$ (306,282)	$ (172,922)
Net loss per share of common stock, basic and diluted	$ (1.05)	$ (0.63)	$ (2.91)	$ (1.75)
Weighted average shares used in computing net loss per share of common stock, basic and diluted	105,556,162	104,076,830	105,195,640	99,039,709