Net Loss Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net Loss (Numerator_ [Abstract]
Net loss basic and diluted	$ (10,500)	$ (11,301)	$ (34,021)	$ (35,107)
Weighted Average Common Shares (Denominator) Abstract
Shares outstanding, basic and diluted (in shares)	60,599	33,848	54,104	33,803
Per share amount [Abstract]
Net loss per share, basic and diluted (in dollars per share)	$ (0.17)	$ (0.33)	$ (0.63)	$ (1.04)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Unvested restricted stock (in shares)		33,627		33,627
Weighted Average Number (in shares)	6,068	6,068	6,047	6,087
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Number (in shares)	6,068	6,035	6,047	6,019
Weighted Average Exercise Price (in dollars per share)	$ 11.14	$ 12.22	$ 11.69	$ 12.31
Unvested restricted stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Number (in shares)	0	33	0	68