Summarized Quarterly 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
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 9,921	$ 7,168	$ 8,942	$ 6,981	$ 9,496	$ 8,453	$ 8,030	$ 18,347	$ 33,012	$ 44,326	$ 37,576
Cost of sales	7,099	5,354	4,630	4,158	6,018	4,249	4,167	5,062	21,241	19,496	19,293
Gross profit	2,822	1,814	4,312	2,823	3,478	4,204	3,863	13,285
Net loss	$ (35,617)	$ (10,852)	$ (13,332)	$ (21,055)	$ (643)	$ (19,282)	$ (17,169)	$ (10,292)	$ (80,856)	$ (47,386)	$ (83,903)
Net loss per share, basic and diluted	$ (0.28)	$ (0.10)	$ (0.13)	$ (0.21)	$ (0.01)	$ (0.21)	$ (0.26)	$ (0.16)	$ (0.74)	$ (0.59)	$ (1.96)
Weighted average shares outstanding, basic and diluted	127,869	104,682	100,876	100,809	100,714	90,370	65,449	65,369	108,568	80,558	42,712