Net Loss Per Share (Tables)

9 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Common share equivalents issuable upon exercise of common stock options		591		975		836		3,501
Common share equivalents issuable upon exercise of common stock warrants		472,968		—		282,437		—
Common share equivalents issuable upon exercise of unit warrants		112,010		—		53,459		—
Shares issuable upon vesting of restricted stock		—		153		1		225
Shares issuable upon conversion of Series 1 convertible preferred stock		2,876,011		—		969,205		—
Shares issuable upon conversion of Series A CPS		293,844		274,359		293,844		274,359
Shares issuable upon conversion of Series B CPS		591,191		164,402		591,191		164,402
Shares issuable upon conversion of Series C CPS		32,536		32,536		32,536		32,536
Shares issuable upon conversion of Series A-1 convertible preferred stock		204,011		313,863		283,513		310,126
Shares issuable upon conversion of  convertible promissory notes		186,140		286,559		258,870		283,049
Total common share equivalents excluded from denominator for diluted earnings per share computation		4,769,302		1,072,847		2,765,892		1,068,198