Consolidated Statements of Comprehensive Loss (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Net Loss	$ (14,984,321)	$ (23,368,283)	$ (35,375,621)
Other comprehensive loss:
Foreign currency translation	(152,075)	(279,898)	(75,087)
Net unrealized gains on marketable securities	90,000	20,201	137,172
Net minimum pension liability	129,445	67,891	(59,655)
Total other comprehensive loss (loss)	67,370	(191,806)	2,430
Total comprehensive loss	$ (14,916,951)	$ (23,560,089)	$ (35,373,191)