CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)	Public Offering [Member] COMMON SHARES	Public Offering [Member]	At The Market [Member] COMMON SHARES	At The Market [Member]	COMMON SHARES	ACCUMULATED DEFICIT	ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS)	Total
Balance at Dec. 31, 2017					$ 273,210,907	$ (240,262,376)	$ (35,383)	$ 32,913,148
Balance (in shares) at Dec. 31, 2017					51,768,424
Increase (Decrease) in Shareholders' Equity
Net Loss						(17,780,313)		(17,780,313)
Unrealized Loss on Available-for-Sale Investments							(47,542)	(47,542)
Foreign Currency Translation Adjustments							(7,389)	(7,389)
Stock-based compensation					$ 1,811,335			1,811,335
Balance at Jun. 30, 2018					$ 275,022,242	(258,042,689)	(90,314)	16,889,239
Balance (in shares) at Jun. 30, 2018					51,768,424
Balance at Mar. 31, 2018					$ 273,656,910	(245,811,897)	(227,863)	27,617,150
Balance (in shares) at Mar. 31, 2018					51,768,424
Increase (Decrease) in Shareholders' Equity
Net Loss						(12,230,792)		(12,230,792)
Unrealized Loss on Available-for-Sale Investments							142,454	142,454
Foreign Currency Translation Adjustments							(4,905)	(4,905)
Stock-based compensation					$ 1,365,332			1,365,332
Balance at Jun. 30, 2018					$ 275,022,242	(258,042,689)	(90,314)	16,889,239
Balance (in shares) at Jun. 30, 2018					51,768,424
Balance at Dec. 31, 2018					$ 299,601,960	(272,388,234)	63,148	$ 27,276,874
Balance (in shares) at Dec. 31, 2018					57,034,154			57,034,154
Increase (Decrease) in Shareholders' Equity
Net Loss						(18,970,530)		$ (18,970,530)
Unrealized Loss on Available-for-Sale Investments							4,265	4,265
Foreign Currency Translation Adjustments							144	144
Exercise of Employee Stock Option					$ 147,900			$ 147,900
Exercise of Employee Stock Option (in shares)					30,000			30,000
Delivery of common stock underlying restricted stock units, net of tax					$ (95,429)			$ (95,429)
Delivery of common stock underlying restricted stock units, net of tax (in shares)					64,173
Issuance of Common Shares	$ 16,120,679	$ 16,120,679	$ 2,089,208	$ 2,089,208
Issuance of Common Shares (in shares)	5,833,334		437,043
Stock-based compensation					$ 3,018,628			3,018,628
Balance at Jun. 30, 2019					$ 320,882,946	(291,358,764)	67,557	$ 29,591,739
Balance (in shares) at Jun. 30, 2019					63,398,704			63,398,704
Balance at Mar. 31, 2019					$ 301,171,733	(281,066,581)	55,895	$ 20,161,047
Balance (in shares) at Mar. 31, 2019					57,128,327
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 Shares	$ 16,120,679	$ 16,120,679	$ 2,089,208	$ 2,089,208
Issuance of Common Shares (in shares)	5,833,334		437,043
Stock-based compensation					$ 1,501,326			1,501,326
Balance at Jun. 30, 2019					$ 320,882,946	$ (291,358,764)	$ 67,557	$ 29,591,739
Balance (in shares) at Jun. 30, 2019					63,398,704			63,398,704