Consolidated Statements of Comprehensive Loss - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net loss	$ (1,929,361)	$ (7,211,821)	$ (10,932,590)
Other comprehensive (loss) income, net of applicable taxes:
Foreign currency translation	(190,499)	157,410	(92,767)
Net unrealized loss on marketable securities	(1,998)	(4,818)	(2,800)
Net minimum pension liability	573	98,505	(16,770)
Total other comprehensive (loss) income, net of applicable taxes:	(191,924)	251,097	(112,337)
Total comprehensive loss	(2,121,285)	(6,960,724)	(11,044,927)
Less: Accrual of Series A redeemable convertible preferred stock dividends	765,203	747,616	216,379
Less: Accretion to redemption value of Series A redeemable convertible preferred stock	587,613	493,363	127,504
Total comprehensive loss attributable to common stockholders	$ (3,474,101)	$ (8,201,703)	$ (11,388,810)