Selected Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Selected Financial Data (Unaudited)
Total revenue	$ 44,057	$ 27,379	$ 5,534	$ 4,112	$ 1,971	$ 41			$ 81,082	$ 2,012
Total gross profit (loss)	40,892	26,638	514	(2,055)	1,788	37
Operating expenses	52,752	68,056	56,979	57,909	58,255	40,573	24,317	18,772	235,696	141,917	47,076
Net loss from continuing operations	(17,164)	(48,379)	(55,635)	(53,768)	(56,229)	(40,476)	(24,266)	(18,762)	(174,946)	(139,733)	(47,026)
Net income from discontinued operations		$ 175	$ 123	$ 192	$ (430)	$ 80	$ 218	$ (16)	$ 490	$ (148)	$ 886
Basic and diluted net (loss) per share:
Continuing operations (in dollars per share)	$ (0.17)	$ (0.48)	$ (0.55)	$ (0.53)	$ (0.56)	$ (0.40)	$ (0.24)	$ (0.20)	$ (1.72)	$ (1.42)	$ (0.56)
Discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.01