CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($)	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2016		10,987,166	0
Beginning balance at Dec. 31, 2016	$ 12,846,781	$ 54,932	$ 0	$ 158,773,753	$ (564,559)	$ (150,740,156)	$ 5,322,811
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of warrants (in shares)		292,668
Exercise of warrants	4,334,110	$ 1,463		4,332,647
Net loss	(9,842,672)					(9,706,456)	(136,216)
Unrealized gain on short-term investments	362				362
Foreign currency translation	69,789				47,740		22,049
Ending balance (in shares) at Dec. 31, 2017		11,279,834	0
Ending balance at Dec. 31, 2017	7,408,370	$ 56,395	$ 0	163,106,400	(516,457)	(160,446,612)	5,208,644
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of warrants (in shares)		18,405
Exercise of warrants	0	$ 92		55,123
Net loss	(3,707,447)					(3,611,973)	(95,474)
Unrealized gain on short-term investments	1,924				1,924
Foreign currency translation	(144,035)				(96,837)		(47,198)
Ending balance (in shares) at Dec. 31, 2018		11,298,239	0
Ending balance at Dec. 31, 2018	$ 3,614,027	$ 56,487	$ 0	$ 163,161,523	$ (611,370)	$ (164,058,585)	$ 5,065,972