Income Taxes (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loss before income taxes:
Domestic	$ (174,083,000)	$ (138,599,000)	$ (46,836,000)
International	(766,000)	(1,107,000)
Loss from continuing operations before income taxes	(174,849,000)	(139,706,000)	(46,836,000)
Current
State	97,000	27,000	190,000
Total current (benefit)/provision for income taxes	97,000	27,000	190,000
Total (benefit)/provision for income taxes from continuing operations	97,000	27,000	190,000
Federal income tax
Credit carryforwards
Tax credit carryforwards to reduce future taxable income	13,900,000
State income tax
Credit carryforwards
Tax credit carryforwards to reduce future taxable income	$ 4,300,000