CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (639,801)	$ (3,534,882)	$ (1,751,998)	$ (7,831,494)
Other comprehensive income (loss), net of applicable taxes:
Foreign currency translation	5,433	(334,161)	(180,096)	(561,576)
Net unrealized gain on marketable securities	0	(283)	0	3,756
Net minimum pension liability	0	678	0	3,854
Total other comprehensive income (loss), net of applicable taxes:	5,433	(333,766)	(180,096)	(553,966)
Total comprehensive loss	(634,368)	(3,868,648)	(1,932,094)	(8,385,460)
Less: Accrual of Series A redeemable convertible preferred stock dividends	215,089	195,366	419,664	387,974
Less: Accretion to redemption value of Series A redeemable convertible preferred stock	0	170,981	0	334,650
Total comprehensive loss attributable to common stockholders	$ (849,457)	$ (4,234,995)	$ (2,351,758)	$ (9,108,084)