Derivatives and other liabilities (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2013

Dec. 31, 2012

Schedule Of Derivative And Other Long Term Liabilities At Fair Value [Table Text Block]

Derivative and other liabilities consisted of the following:

	March 31,		December 31,
	2013		2012
Derivative liability, long-term portion	$	591,078	$	780,960
Long-term portion of convertible debt, net of unamortized discount		181,862		462,815
Deferred rent		41,741		58,005
Deferred tax liability		54,890		50,000
Interest payable		39,379		33,379
Conditional grant payable		30,000		30,000
Accrued term loan fee		3,482		—
	$	942,432	$	1,415,159

Derivative and other liabilities consisted of the following:

	December 31, 2012		December 31, 2011
Derivative liability, long-term portion	$	780,960	$	1,294,740
Long-term portion of convertible debt, net of unamortized discount		462,815		223,333
Deferred rent		58,005		—
Deferred tax liability		50,000		32,000
Interest payable		33,379		8,982
Conditional grant payable		30,000		—
	$	1,415,159	$	1,559,055