Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Basic and diluted numerator:
Net loss attributable to common stockholders	$ (9,530)	$ (12,151)	$ (16,076)	$ (17,390)
Basic and diluted denominator:
Weighted average shares of common stock outstanding during the period	27,418,854	16,708,396	25,490,630	10,390,076
Basic and diluted net loss per common stock share	$ (0.35)	$ (0.73)	$ (0.63)	$ (1.67)
Diluted Denominator:
Common shares issuable upon conversion of Series D Preferred Stock (not including dividends or conversion premium paid in common stock)	4,652,632	0	4,652,632	0
Antidilutive Securities	19,195,944	16,157,877	19,195,944	16,157,877
Restricted Stock Units (RSUs) [Member]
Diluted Denominator:
Antidilutive Securities	0	1,226,063	0	1,226,063
Shares Issuable Upon Preferred Stock Conversion [Member]
Diluted Denominator:
Antidilutive Securities	27,404	1,433,100	27,404	1,433,100
Warrant [Member]
Diluted Denominator:
Antidilutive Securities	10,782,405	7,908,065	10,782,445	7,908,065
Common Stock [Member]
Diluted Denominator:
Antidilutive Securities	3,733,503	5,706,854	3,733,503	5,706,854