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

3 Months Ended

Mar. 31, 2014

Disclosure Text Block Supplement [Abstract]

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

	March 31, 2014		December 31, 2013
Cash and cash equivalents	$	49,958,339	$	45,443,759
Current and noncurrent marketable securities		9,684,460		13,097,735
Restricted cash		1,301,000		1,301,000
Total cash and cash equivalents, current and noncurrent marketable securities and restricted cash	$	60,943,799	$	59,842,494