CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Accumulated Deficit	Total
Balance at Dec. 31, 2018	$ 31,774	$ 186,138,466	$ 288,175	$ (169,523,815)	$ 16,934,600
Balance (in shares) at Dec. 31, 2018	31,774,139
Stock based compensation - employees, consultants and directors	$ 0	227,658	0	0	227,658
Other comprehensive income, foreign translation adjustment	0	0	306,287	0	306,287
Proceeds from exercise of stock options	$ 47	236,023	0	0	236,070
Proceeds from exercise of stock options (in shares)	46,734
Cashless exercise of stock options	$ 0	0	0	0	0
Cashless exercise of stock options (in shares)	967
Cashless exercise of warrants	$ 9	(9)	0	0	0
Cashless exercise of warrants (in shares)	9,029
Issuance of restricted stock units	$ 52	425,587	0	0	425,639
Issuance of restricted stock units (in shares)	51,817
Proceeds from exercise of warrants	$ 361	1,768,130	0	0	1,768,491
Proceeds from exercise of warrants (in shares)	360,358
Net loss	$ 0	0	0	(4,883,827)	(4,883,827)
Balance at Mar. 31, 2019	$ 32,243	188,795,855	594,462	(174,407,642)	15,014,918
Balance (in shares) at Mar. 31, 2019	32,243,044
Balance at Dec. 31, 2018	$ 31,774	186,138,466	288,175	(169,523,815)	16,934,600
Balance (in shares) at Dec. 31, 2018	31,774,139
Balance at Dec. 31, 2019	$ 32,616	191,648,907	525,978	(188,789,459)	3,418,042
Balance (in shares) at Dec. 31, 2019	32,616,107
Stock based compensation - employees, consultants and directors	$ 0	729,429	0	0	729,429
Other comprehensive income, foreign translation adjustment	0	0	609,828	0	609,828
Proceeds from exercise of stock options	$ 38	138,392	0	0	138,430
Proceeds from exercise of stock options (in shares)	38,277
Issuance of restricted stock units	$ 55	328,884	0	0	328,939
Issuance of restricted stock units (in shares)	54,734
Issuance of common stock, net of fees incurred	$ 3,421	19,538,200	0	0	$ 19,541,621
Issuance of common stock, net of fees incurred (in shares)	3,421,237				3,627,760
Net loss	$ 0	0	0	(3,452,779)	$ (3,452,779)
Balance at Mar. 31, 2020	$ 36,130	$ 212,383,812	$ 1,135,806	$ (192,242,238)	$ 21,313,510
Balance (in shares) at Mar. 31, 2020	36,130,355