Selected 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
Selected Financial Data (Unaudited)
Total revenue	$ 1,971	$ 41							$ 2,012
Total gross profit	1,788	37
Operating expenses	58,255	40,573	24,317	18,772	11,889	8,941	16,338	9,908	141,917	47,076	65,627
Net loss from continuing operations	(56,229)	(40,476)	(24,266)	(18,762)	(12,043)	(8,812)	(16,304)	(9,867)	(139,733)	(47,026)	(75,434)
Net income (loss) from discontinued operations	$ (430)	$ 80	$ 218	$ (16)	$ 580	$ 185	$ 107	$ 14	$ (148)	$ 886	$ 9,369
Basic and diluted net income (loss) per share:
Continuing operations (in dollars per share)	$ (0.56)	$ (0.40)	$ (0.24)	$ (0.20)	$ (0.14)	$ (0.10)	$ (0.20)	$ (0.12)	$ (1.42)	$ (0.56)	$ (0.93)
Discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.01	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.01	$ 0.11