Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Basic and diluted net loss per share of common stock:
Net loss	$ (3,607)us-gaap_NetIncomeLoss	$ (1,668)us-gaap_NetIncomeLoss	$ (3,323)us-gaap_NetIncomeLoss	$ (2,235)us-gaap_NetIncomeLoss	$ (1,394)us-gaap_NetIncomeLoss	$ (1,224)us-gaap_NetIncomeLoss	$ (1,682)us-gaap_NetIncomeLoss	$ (970)us-gaap_NetIncomeLoss	$ (10,833)us-gaap_NetIncomeLoss	$ (5,270)us-gaap_NetIncomeLoss
Dividends on Series B and C Preferred Stock		(372)	(1,102)	(1,071)	(1,049)	(1,029)	(940)	(786)	(2,545)	(3,804)
Net loss applicable to common stockholders	$ (3,607)	$ (2,040)	$ (4,425)	$ (3,306)	$ (2,443)	$ (2,253)	$ (2,622)	$ (1,756)	$ (13,378)	$ (9,074)
Weighted average shares of common stock outstanding (in shares)									6,152,669	462,972
Net loss per share of common stock-basic and diluted (in dollars per share)	$ (0.26)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.22)us-gaap_EarningsPerShareBasicAndDiluted	$ (7.98)us-gaap_EarningsPerShareBasicAndDiluted	$ (7.09)us-gaap_EarningsPerShareBasicAndDiluted	$ (5.54)us-gaap_EarningsPerShareBasicAndDiluted	$ (4.58)us-gaap_EarningsPerShareBasicAndDiluted	$ (5.66)us-gaap_EarningsPerShareBasicAndDiluted	$ (3.82)us-gaap_EarningsPerShareBasicAndDiluted	$ (2.17)us-gaap_EarningsPerShareBasicAndDiluted	$ (19.60)us-gaap_EarningsPerShareBasicAndDiluted
Loss per share of common stock
Antidilutive securities excluded from the computation of diluted weighted average shares outstanding (in shares)									1,670,574	9,160,161
Convertible preferred stock.
Loss per share of common stock
Antidilutive securities excluded from the computation of diluted weighted average shares outstanding (in shares)										7,596,927
Warrants
Loss per share of common stock
Antidilutive securities excluded from the computation of diluted weighted average shares outstanding (in shares)										470,026
Stock options
Loss per share of common stock
Antidilutive securities excluded from the computation of diluted weighted average shares outstanding (in shares)									1,670,574	1,093,208