CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,429,173	$ (1,976,173)	$ (322,825)	$ (9,807,667)
Other comprehensive income (loss), net of applicable taxes:
Foreign currency translation	104,917	59,527	(75,179)	(502,049)
Net unrealized gain (loss) on marketable securities	0	(279)	0	3,477
Net minimum pension liability	0	3,874	0	7,728
Total other comprehensive income (loss), net of applicable taxes:	104,917	63,122	(75,179)	(490,844)
Total comprehensive income (loss)	1,534,090	(1,913,051)	(398,004)	(10,298,511)
Less: Accrual of Series A redeemable convertible preferred stock dividends	215,000	194,012	634,664	581,986
Less: Accretion to redemption value of Series A redeemable convertible preferred stock	0	178,619	0	513,269
Total comprehensive income (loss) attributable to common stockholders	$ 1,319,090	$ (2,285,682)	$ (1,032,668)	$ (11,393,766)