Cash and cash equivalents (Tables)

6 Months Ended

Jun. 30, 2014

Cash And Cash Equivalents [Abstract]

Schedule of Cash and Cash Equivalents

	JUNE 30, 2014		DECEMBER 31, 2013
Cash	$	2,144,656	$	7,292,116
Cash equivalents		15,751,454		3,714,276
	$	17,896,110	$	11,006,392