Cash and Cash Equivalents, Marketable Securities and Restricted Cash (Tables)

9 Months Ended

Sep. 30, 2013

Disclosure Text Block Supplement [Abstract]

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

	September 30, 2013		December 31, 2012
Cash and cash equivalents	$	39,625,879	$	23,845,360
Current and noncurrent marketable securities		17,434,880		35,394,318
Restricted cash		1,301,000		1,301,000
Total cash and cash equivalents, current and noncurrent marketable securities and restricted cash	$	58,361,759	$	60,540,678