Cash and cash equivalents (Tables)

3 Months Ended

Mar. 31, 2014

Cash And Cash Equivalents [Abstract]

Schedule of Cash and Cash Equivalents

	MARCH 31, 2014		DECEMBER 31, 2013
Cash	$	49,538,874	$	7,292,116
Cash equivalents		3,379,453		3,714,276
	$	52,918,327	$	11,006,392