CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	ACCUMULATED DEFICIT	ACCUMULATED OTHER COMPREHENSIVE INCOME
Beginning balance (in shares) at Dec. 31, 2018		57,034,154
Beginning balance at Dec. 31, 2018	$ 27,276,874	$ 5,703	$ 299,596,257	$ (272,388,234)	$ 63,148
Increase (Decrease) in Shareholders' Equity
Net Loss	(8,678,347)			(8,678,347)
Unrealized Loss on Available-for-Sale Investments	(7,161)				(7,161)
Foreign Currency Translation Adjustments	(92)				(92)
Exercise of Employee Stock Options, Net of Tax (in shares)		30,000
Exercise of Employee Stock Options, Net of Tax	147,900	$ 3	147,897
Delivery of common stock underlying restricted stock units, net of tax (in shares)		64,173
Delivery of common stock underlying restricted stock units, net of tax	(95,429)	$ 7	(95,436)
Stock-based Compensation	1,517,302		1,517,302
End balance (in shares) at Mar. 31, 2019		57,128,327
End balance at Mar. 31, 2019	20,161,047	$ 5,713	301,166,020	(281,066,581)	55,895
Beginning balance (in shares) at Dec. 31, 2018		57,034,154
Beginning balance at Dec. 31, 2018	$ 27,276,874	$ 5,703	299,596,257	(272,388,234)	63,148
Increase (Decrease) in Shareholders' Equity
Issuance of common stock, net of offering costs/Bought Deal (in shares)	1,840,443
End balance (in shares) at Dec. 31, 2019	65,378,890	65,378,890
End balance at Dec. 31, 2019	$ 20,319,503	$ 6,538	326,777,250	(306,516,265)	51,980
Increase (Decrease) in Shareholders' Equity
Net Loss	(7,983,738)			(7,983,738)
Unrealized Loss on Available-for-Sale Investments	(6,710)				(6,710)
Foreign Currency Translation Adjustments	5,611				5,611
Issuance of common stock, net of offering costs/Bought Deal (in shares)		3,670,212
Issuance of common stock, net of offering costs/Bought Deal	8,003,957	$ 367	8,003,590
Issuance of Warrants related to Debt Financing	500,736		500,736
Stock-based Compensation	$ 934,846		934,846
End balance (in shares) at Mar. 31, 2020	69,049,102	69,049,102
End balance at Mar. 31, 2020	$ 21,774,205	$ 6,905	$ 336,216,422	$ (314,500,003)	$ 50,881