Convertible Preference Shares of Subsidiary (Tables)

9 Months Ended

Sep. 30, 2013

Convertible Preference Shares of Subsidiary (Tables) [Line Items]

Schedule of Stock by Class [Table Text Block]

Class	Number	Initial	Issuance	Gross		Issuance			Exchange			Net Cash		Date if	CPS
of CPS	of CPS	Investor	Date	Proceeds		(Costs)			Gain (loss)			Proceeds		Exchanged	Outstanding
Series A	444,444	MTDC	07/18/2008	$	1,000,000	$	(30,000	)	$	—		$	970,000	—	444,444
Series A	444,444	MTDC	11/27/2008		1,000,000		(30,000	)		—			970,000	—	444,444
Series B	111,111	EEV	06/08/2009		250,000		(19,393	)		(18,029	)		212,578	08/17/2010	—
Series B	111,111	EEV	03/09/2010		250,000		(8,929	)		(3,005	)		238,066	08/17/2010	—
Series B	222,222	PMSB	09/23/2009		500,000		(7,500	)		—			492,500	—	222,222
Series B	222,222	PMSB	05/13/2010		500,000		(5,000	)		—			495,000	—	222,222
Series B	188,057	KMP	09/18/2009		423,128		(11,319	)		—			411,809	09/29/2010	—
Subtotal	1,743,611				3,923,128		(112,141	)		(21,034	)		3,789,953		1,333,332
Series C	3,233,734	MTDC	03/10/2011		5,000,000		(6,272	)		58,575			5,052,303	—	3,233,734
	4,977,345			$	8,923,128	$	(118,413	)	$	37,541		$	8,842,256		4,567,066

Convertible Preferred Stock [Member] | Series B Preferred Stock [Member]

Convertible Preference Shares of Subsidiary (Tables) [Line Items]

Fair Value, by Balance Sheet Grouping [Table Text Block]

	September 30, 2013	September 30, 2012
Risk-free interest rate	0.04%	0.18%
Expected remaining term	0.51 Years	1.21 Years
Expected volatility	102.38%	119.55%
Dividend yield	0%	0%

Convertible Preferred Stock [Member] | Series A Preferred Stock [Member]

Convertible Preference Shares of Subsidiary (Tables) [Line Items]

Fair Value, by Balance Sheet Grouping [Table Text Block]

	September 30, 2013		September  30, 2012
Risk-free interest rate	0.02% - 0.03%	0	0.16% - 0.18%
Expected remaining term	0.10 - 0.16 Years		0.80 - 1.16 Years
Expected volatility	77.99 - 78.79%		120.84 - 125.60%
Dividend yield	0%		0%