Convertible Preference Shares of Subsidiary (Tables)

12 Months Ended

6 Months Ended

12 Months Ended

Dec. 31, 2012

Series B CPS [Member]

Convertible Preferred Stock [Member]

Dec. 31, 2012

Series A CPS [Member]

Convertible Preferred Stock [Member]

Jun. 30, 2013

Convertible Preferred Stock [Member]

Series B Preferred Stock [Member]

Jun. 30, 2013

Convertible Preferred Stock [Member]

Series A Preferred Stock [Member]

Jun. 30, 2013

Convertible Preferred Stock [Member]

Dec. 31, 2012

Convertible Preferred Stock [Member]

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

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

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

	December 31, 2012	December 31, 2011
Risk-free interest rate	0.16%	0.28%
Expected remaining term	1.00 Years	1.81 Years
Expected volatility	125.53%	81.69%
Dividend yield	0%	0%

	December 31, 2012	December 31, 2011
Risk-free interest rate	0.11% - 0.15%	0.28%
Expected remaining term	0.55 – 0.90 Years	1.55 - 1.90 Years
Expected volatility	123.55% - 127.94%	81.15% - 82.83%
Dividend yield	0%	0%

	June 30, 2013	June 30, 2012
Risk-free interest rate	0.11%	0.26%
Expected remaining term	0.61 Years	1.41 Years
Expected volatility	135.80%	106.00%
Dividend yield	0%	0%

	June 30, 2013		June 30, 2012
Risk-free interest rate	0.02% - 0.08%	0	0.22% - 0.26%
Expected remaining term	0.11 - 0.41 Years		1.05 - 1.41 Years
Expected volatility	111.30 - 123.77%		105.96 - 114.25%
Dividend yield	0%		0%