Consolidated Statements of Comprehensive Loss (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net loss	$ (7,211,821)	$ (10,932,590)	$ (14,984,321)
Other comprehensive (loss) income, net of taxes:
Foreign currency translation	157,410	(92,767)	(152,075)
Net unrealized (loss) gain on marketable securities	(4,818)	(2,800)	90,000
Net minimum pension liability	98,505	(16,770)	129,445
Total other comprehensive income (loss), net of taxes:	251,097	(112,337)	67,370
Total comprehensive loss	(6,960,724)	(11,044,927)	(14,916,951)
Less: Accrual of Series A redeemable convertible preferred stock dividends	747,616	216,379	0
Less: Accretion to redemption value of Series A redeemable convertible preferred stock	493,363	127,504	0
Total comprehensive loss attributable to common stockholders	$ (8,201,703)	$ (11,388,810)	$ (14,916,951)