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

6 Months Ended

Jun. 30, 2014

Disclosure Text Block Supplement [Abstract]

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

	June 30, 2014		December 31, 2013
Cash and cash equivalents	$	50,224,059	$	45,443,759
Current and noncurrent marketable securities		7,606,800		13,097,735
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	$	59,131,859	$	59,842,494