Net Loss Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net Loss (Numerator) [Abstract]
Net loss basic and diluted	$ (9,313)	$ (11,258)
Weighted Average Common Shares (Denominator) Abstract
Shares outstanding, basic and diluted (in shares)	63,958,000	50,116,000
Per share amount [Abstract]
Net loss per share, basic and diluted (in dollars per share)	$ (0.15)	$ (0.22)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Unvested restricted stock (in shares)		27,793
Weighted Average Number (in shares)	5,868,000	5,756,000
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Number (in shares)	5,868,000	5,728,000
Weighted Average Exercise Price (in dollars per share)	$ 10.74	$ 12.37
Unvested restricted stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Number (in shares)	0	28,000