Consolidated Statements of Stockholders' Equity - USD ($)	Common Stock	Additional paid-in capital	Accumulated deficit	Total
Beginning balance at Dec. 31, 2018	$ 3,009	$ 108,485,219	$ (107,550,307)	$ 937,921
Balance (in shares) at Dec. 31, 2018	30,087,213
Stock-based compensation		1,256,310		1,256,310
Issuance of common stock upon exercise of options	$ 5	410,157		410,162
Issuance of common stock upon exercise of options (in shares)	52,819
Issuance of warrants upon debt financing		426,000		426,000
Issuance of common stock upon financing	$ 316	24,983,366		24,983,682
Issuance of common stock upon financing (in shares)	3,164,015
Net loss			(10,640,376)	(10,640,376)
Ending balance at Mar. 31, 2019	$ 3,330	135,561,052	(118,190,683)	17,373,699
Balance (in shares) at Mar. 31, 2019	33,304,047
Beginning balance at Dec. 31, 2018	$ 3,009	108,485,219	(107,550,307)	937,921
Balance (in shares) at Dec. 31, 2018	30,087,213
Net loss				(24,402,590)
Ending balance at Jun. 30, 2019	$ 3,433	156,232,409	(131,952,897)	24,282,945
Balance (in shares) at Jun. 30, 2019	34,330,441
Beginning balance at Mar. 31, 2019	$ 3,330	135,561,052	(118,190,683)	17,373,699
Balance (in shares) at Mar. 31, 2019	33,304,047
Stock-based compensation		888,556		888,556
Issuance of common stock upon exercise of options	$ 6	205,330		205,336
Issuance of common stock upon exercise of options (in shares)	59,720
Issuance of common stock upon exercise of warrants	$ 2	144,868		144,870
Issuance of common stock upon exerciseof warrants (in shares)	24,389
Issuance of warrants upon debt financing		(39,000)		(39,000)
Issuance of common stock upon financing	$ 95	19,471,603		19,471,698
Issuance of common stock upon financing (in shares)	942,285
Net loss			(13,762,214)	(13,762,214)
Ending balance at Jun. 30, 2019	$ 3,433	156,232,409	(131,952,897)	24,282,945
Balance (in shares) at Jun. 30, 2019	34,330,441
Beginning balance at Dec. 31, 2019	$ 3,693	354,614,189	(175,895,493)	$ 178,722,389
Balance (in shares) at Dec. 31, 2019	36,933,217			36,933,217
Stock-based compensation		2,133,530		$ 2,133,530
Issuance of common stock upon exercise of options	$ 6	629,750		629,756
Issuance of common stock upon exercise of options (in shares)	60,186
Issuance of common stock upon financing	$ 8	7,155,329		7,155,337
Issuance of common stock upon financing (in shares)	82,019
Net loss			(32,484,146)	(32,484,146)
Ending balance at Mar. 31, 2020	$ 3,707	364,532,798	(208,379,639)	156,156,866
Balance (in shares) at Mar. 31, 2020	37,075,422
Beginning balance at Dec. 31, 2019	$ 3,693	354,614,189	(175,895,493)	$ 178,722,389
Balance (in shares) at Dec. 31, 2019	36,933,217			36,933,217
Issuance of common stock upon exercise of options (in shares)				80,614
Net loss				$ (50,811,138)
Ending balance at Jun. 30, 2020	$ 3,726	380,946,215	(226,706,631)	$ 154,243,310
Balance (in shares) at Jun. 30, 2020	37,267,510			37,267,510
Beginning balance at Mar. 31, 2020	$ 3,707	364,532,798	(208,379,639)	$ 156,156,866
Balance (in shares) at Mar. 31, 2020	37,075,422
Stock-based compensation		4,148,025		4,148,025
Issuance of common stock upon exercise of options	$ 2	190,407		190,409
Issuance of common stock upon exercise of options (in shares)	20,428
Issuance of common stock upon exercise of warrants	$ 3			3
Issuance of common stock upon exerciseof warrants (in shares)	29,982
Issuance of warrants upon debt financing (in shares)	141,678
Issuance of common stock upon financing	$ 14	12,074,985		12,074,999
Net loss			(18,326,992)	(18,326,992)
Ending balance at Jun. 30, 2020	$ 3,726	$ 380,946,215	$ (226,706,631)	$ 154,243,310
Balance (in shares) at Jun. 30, 2020	37,267,510			37,267,510