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Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Financial Data (Unaudited) [Abstract]
Operating loss	$ (11,825)	$ (12,175)	$ (15,316)	$ (14,554)	$ (15,974)	$ (12,181)	$ (10,486)	$ (7,814)	$ 53,871	$ 46,456	$ 30,743
Change in fair value of warranty liability, net	1,134	446	917	(338)	702	3,872	5,027	5,966	2,200
Net loss	$ (10,657)	$ (11,813)	$ (14,512)	$ (14,889)	$ (15,268)	$ (8,309)	$ (5,459)	$ (1,848)	$ (51,868)	$ (30,885)	$ (46,684)
Basic and diluted loss per share (in dollars per share)	$ (0.14)	$ (0.18)	$ (0.26)	$ (0.31)	$ (0.32)	$ (0.18)	$ (0.13)	$ (0.04)	$ (0.85)	$ (0.68)	$ (1.2)

X

- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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