Loss Per Share Antidilutive (Details) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Out-of-the-money options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common shares excluded from computation of earnings per share	1,300
Unvested restricted stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common shares excluded from computation of earnings per share	311	684
Shares of common stock issuable upon conversion of preferred stock, Series A-2 [Member] | Series A-2 Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common shares excluded from computation of earnings per share	133	133
Stock options outstanding [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common shares excluded from computation of earnings per share	1,321	1,665
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive common shares excluded from computation of earnings per share	2,769	0