CHANGES TO STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($)	Total	Common Stock - Voting	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income	Treasury Stock
BALANCES at Dec. 31, 2017	$ 116,902,978	$ 35,132	$ 312,783,195	$ (195,991,478)	$ 76,129
Shares, Outstanding at Dec. 31, 2017		35,132,548
Exercise of options to purchase common stock	53,862	$ 7	53,855
Exercise of options to purchase common stock, shares		6,696
Share-based compensation expense	1,092,260		1,092,260
Foreign Currency Translation	199,554				199,554
Net loss	(3,520,937)			(3,520,937)
BALANCES at Mar. 31, 2018	114,727,717	$ 35,139	313,929,310	(199,512,415)	275,683
Shares, Outstanding at Mar. 31, 2018		35,139,244
BALANCES at Dec. 31, 2018	121,474,475	$ 35,556	323,079,437	(201,352,682)	(31,610)	$ (256,226)
Shares, Outstanding at Dec. 31, 2018		35,556,595				14,169
Exercise of options to purchase common stock	1,791,668	$ 248	1,791,420
Exercise of options to purchase common stock, shares		248,195
Issuance of restricted stock units, net of tax withholdings	(673,774)	$ 62	(673,836)
Issuance of restricted stock units, net of tax withholdings, shares		61,532
Share-based compensation expense	1,260,126		1,260,126
Foreign Currency Translation	91,047				91,047
Net loss	(3,422,000)			(3,422,000)
BALANCES at Mar. 31, 2019	$ 120,521,542	$ 35,866	$ 325,457,147	$ (204,774,682)	$ 59,437	$ (256,226)
Shares, Outstanding at Mar. 31, 2019		35,866,322				14,169