Related party transactions (Tables)

12 Months Ended

Dec. 31, 2012

Related party transactions

Schedule of amounts incurred to companies that are principally owned by executives, directors or stockholders of the Company or their families

	Year ended December 31,
	2012		2011		2010
Rent	$	500,785	$	487,677	$	493,037
Consulting and professional fees	132,103		74,246		21,291