CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	ACCUMULATED DEFICIT	ACCUMULATED OTHER COMPREHENSIVE INCOME	Bought Deal	Bought Deal COMMON STOCK	Bought Deal ADDITIONAL PAID-IN CAPITAL	Public offering	Public offering COMMON STOCK	Public offering ADDITIONAL PAID-IN CAPITAL	At-the-market offering	At-the-market offering COMMON STOCK	At-the-market offering ADDITIONAL PAID-IN CAPITAL
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)
Vesting of Restricted Stock Units Issued, net of taxes withheld (in shares)		64,173
Vesting of Restricted Stock Units Issued, net of taxes withheld	(95,429)	$ 7	(95,436)
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
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
Net Loss	(18,970,530)
Unrealized Loss on Available-for-Sale Investments	4,265
Foreign Currency Translation Adjustments	144
End balance (in shares) at Jun. 30, 2019		63,398,704
End balance at Jun. 30, 2019	29,591,739	$ 6,340	320,876,606	(291,358,764)	67,557
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 (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
Beginning balance (in shares) at Mar. 31, 2019		57,128,327
Beginning balance at Mar. 31, 2019	20,161,047	$ 5,713	301,166,020	(281,066,581)	55,895
Increase (Decrease) in Shareholders' Equity
Net Loss	(10,292,183)			(10,292,183)
Unrealized Loss on Available-for-Sale Investments	11,426				11,426
Foreign Currency Translation Adjustments	236				236
Issuance of common stock, net of offering costs (in shares)										5,833,334			437,043
Issuance of common stock, net of offering costs									$ 16,120,679	$ 583	$ 16,120,096	$ 2,089,208	$ 44	$ 2,089,164
Stock-based Compensation	1,501,326		1,501,326
End balance (in shares) at Jun. 30, 2019		63,398,704
End balance at Jun. 30, 2019	$ 29,591,739	$ 6,340	320,876,606	(291,358,764)	67,557
Beginning balance (in shares) at Dec. 31, 2019	65,378,890	65,378,890
Beginning 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 (in shares)							3,670,212
Issuance of common stock, net of offering costs						$ 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
End balance at Mar. 31, 2020	$ 21,774,205	$ 6,905	336,216,422	(314,500,003)	50,881
Beginning balance (in shares) at Dec. 31, 2019	65,378,890	65,378,890
Beginning 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	(14,876,283)
Unrealized Loss on Available-for-Sale Investments	(12,411)
Foreign Currency Translation Adjustments	$ 6,147
Issuance of common stock, net of offering costs (in shares)	987,716
End balance (in shares) at Jun. 30, 2020	70,156,922	70,156,922
End balance at Jun. 30, 2020	$ 16,211,570	$ 7,017	337,551,385	(321,392,548)	45,716
Beginning balance (in shares) at Mar. 31, 2020		69,049,102
Beginning balance at Mar. 31, 2020	21,774,205	$ 6,905	336,216,422	(314,500,003)	50,881
Increase (Decrease) in Shareholders' Equity
Net Loss	(6,892,545)			(6,892,545)
Unrealized Loss on Available-for-Sale Investments	(5,701)				(5,701)
Foreign Currency Translation Adjustments	536				536
Issuance of common stock, net of offering costs (in shares)										987,716
Issuance of common stock, net of offering costs									$ 1,977,630	$ 99	$ 1,977,531
Vesting of Restricted Stock Units Issued, net of taxes withheld (in shares)		120,104
Vesting of Restricted Stock Units Issued, net of taxes withheld	(18,863)	$ 13	(18,876)
Warrant Modification Expense	837,322		837,322
Stock-based Compensation	$ (1,461,014)		(1,461,014)
End balance (in shares) at Jun. 30, 2020	70,156,922	70,156,922
End balance at Jun. 30, 2020	$ 16,211,570	$ 7,017	$ 337,551,385	$ (321,392,548)	$ 45,716