CASH AND CASH EQUIVALENTS, MARKETABLE SECURITIES AND RESTRICTED CASH (Tables)

6 Months Ended

Jun. 30, 2012

Schedule Of Cash Cash Equivalents Marketable Securities And Restricted Cash [Table Text Block]

Summary of Cash and Cash Equivalents, Marketable Securities and Restricted Cash

	June 30, 2012		December 31, 2011
Cash and cash equivalents	$	20,535,644	$	44,865,191
Current and noncurrent marketable securities		46,826,522		28,789,603
Current and noncurrent restricted cash		1,660,370		1,660,370
Total cash and cash equivalents, current and noncurrent marketable securities and current and noncurrent restricted cash	$	69,022,536	$	75,315,164