CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY - USD ($)	Total	Public-offering	At -the-market	COMMON STOCK	COMMON STOCK Public-offering	COMMON STOCK At -the-market	ADDITIONAL PAID-IN CAPITAL	ADDITIONAL PAID-IN CAPITAL Public-offering	ADDITIONAL PAID-IN CAPITAL At -the-market	ACCUMULATED DEFICIT	ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS)
Balance at Dec. 31, 2017	$ 32,913,148			$ 5,177			$ 273,205,730			$ (240,262,376)	$ (35,383)
Balance (in shares) at Dec. 31, 2017				51,768,424
Increase (Decrease) in Shareholders' Equity
Net Loss	(32,125,858)									(32,125,858)
Unrealized Gain on Available-for-Sale Investments	109,293										109,293
Foreign Currency Translation Adjustments	$ (10,762)										(10,762)
Exercise of Employee Stock Option, Net of Tax (in shares)	267,500
Issuance of Common Stock		$ 67,548			$ 6			$ 67,542
Issuance of Common Stock (in shares)					57,368
Shares Issued in Exchange for Services	$ 21,935,951			$ 554			21,935,397
Shares Issued in Exchange for Services (in shares)				5,541,562
Stock Tendered in Satisfaction of Tax Liabilities	0			$ (33)			33
Stock Tendered in Satisfaction of Tax Liabilities (in shares)				(333,200)
Stock-based Compensation	4,387,554						4,387,554
Balance at Dec. 31, 2018	$ 27,276,874			$ 5,704			299,596,256			(272,388,234)	63,148
Balance (in shares) at Dec. 31, 2018	57,034,154			57,034,154
Increase (Decrease) in Shareholders' Equity
Net Loss	$ (34,128,031)									(34,128,031)
Unrealized Gain on Available-for-Sale Investments	(10,395)										(10,395)
Foreign Currency Translation Adjustments	(773)										(773)
Exercise of Employee Stock Option, Net of Tax	$ 147,900			$ 3			147,897
Exercise of Employee Stock Option, Net of Tax (in shares)	30,000			30,000
Delivery of Common Stock underlying Restricted Stock Units, net of tax	$ (279,347)			$ 21			(279,368)
Delivery of Common Stock underlying Restricted Stock Units, net of tax (in shares)				215,079
Issuance of Common Stock		$ 17,287,898	$ 5,073,600		$ 626	$ 184		$ 17,287,272	$ 5,073,416
Issuance of Common Stock (in shares)					6,259,214	1,840,443
Stock-based Compensation	4,951,777						4,951,777
Balance at Dec. 31, 2019	$ 20,319,503			$ 6,538			$ 326,777,250			$ (306,516,265)	$ 51,980
Balance (in shares) at Dec. 31, 2019	65,378,890			65,378,890