CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)	Ordinary Shares [Member] Private Placement [Member]	Ordinary Shares [Member] License Agreement [Member]	Ordinary Shares [Member]	Capital in Excess of Par Value [Member] Private Placement [Member]	Capital in Excess of Par Value [Member] License Agreement [Member]	Capital in Excess of Par Value [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Accumulated Deficit [Member]	Private Placement [Member]	License Agreement [Member]	Total
Beginning Balance at Dec. 31, 2018			$ 1,064			$ 229,054,460	$ 293,666	$ (148,289,717)			$ 81,059,473
Beginning Balance, Shares at Dec. 31, 2018			27,386,632
Issuance of ordinary shares in connection with a license agreement		$ 6			$ 1,966,334					$ 1,966,340
Issuance of ordinary shares in connection with a license agreement, shares		158,832
Sale of ordinary shares in connection with private placement, net of issuance costs of $2,426,953	$ 225			$ 77,572,822					$ 77,573,047
Sale of ordinary shares in connection with private placement, net of issuance costs, shares	5,797,102
Share-based compensation						2,934,991					2,934,991
Foreign currency translation							(1,133,683)				(1,133,683)
Net loss								(17,981,918)			(17,981,918)
Balance at Mar. 31, 2019			$ 1,295			311,528,607	(840,017)	(166,271,635)			144,418,250
Balance, Shares at Mar. 31, 2019			33,342,566
Beginning Balance at Dec. 31, 2018			$ 1,064			229,054,460	293,666	(148,289,717)			$ 81,059,473
Beginning Balance, Shares at Dec. 31, 2018			27,386,632
Exercised stock options, shares											134,533
Balance at Dec. 31, 2019			$ 1,429			395,630,666	(1,794,042)	(203,035,952)			$ 190,802,101
Balance, Shares at Dec. 31, 2019			36,791,906
Exercised stock options			$ 1			175,076					$ 175,077
Exercised stock options, shares			26,010								26,010
Share-based compensation						5,682,881					$ 5,682,881
Foreign currency translation							3,945,924				3,945,924
Net loss								(15,681,197)			(15,681,197)
Balance at Mar. 31, 2020			$ 1,430			$ 401,488,623	$ 2,151,882	$ (218,717,149)			$ 184,924,786
Balance, Shares at Mar. 31, 2020			36,817,916