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

12 Months Ended

Dec. 31, 2013

Disclosure Text Block Supplement [Abstract]

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

	As of December 31,
	2013		2012
Cash and cash equivalents	$	45,443,759	$	23,845,360
Current and noncurrent marketable securities		13,097,735		35,394,318
Current and noncurrent restricted cash		1,301,000		1,301,000
Total cash and cash equivalents, current and noncurrent marketable securities and current and noncurrent restricted cash	$	59,842,494	$	60,540,678