Consolidated Statements Of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues
Automotive sales	$ 148,568	$ 97,078	$ 111,943
Development services	55,674	19,666
Total revenues	204,242	116,744	111,943
Cost of revenues
Automotive sales	115,482	79,982	102,408
Development services	27,165	6,031
Total cost of revenues	142,647	86,013	102,408
Gross profit	61,595	30,731	9,535
Operating expenses
Research and development (net of development compensation of $23,249 for the year ended December 31, 2009)	208,981	92,996	19,282
Selling, general and administrative	104,102	84,573	42,150
Total operating expenses	313,083	177,569	61,432
Loss from operations	(251,488)	(146,838)	(51,897)
Interest income	255	258	159
Interest expense	(43)	(992)	(2,531)
Other expense, net	(2,646)	(6,583)	(1,445)
Loss before income taxes	(253,922)	(154,155)	(55,714)
Provision for income taxes	489	173	26
Net loss	$ (254,411)	$ (154,328)	$ (55,740)
Net loss per share of common stock, basic and diluted	$ (2.53)	$ (3.04)	$ (7.94)
Weighted average shares used in computing net loss per share of common stock, basic and diluted	100,388,815	50,718,302	7,021,963