Consolidated Statements of Stockholders' Equity - USD ($)	Common Stock	Additional paid-in capital	Accumulated deficit	Total
Beginning balance at Dec. 31, 2016	$ 1,916	$ 69,210,986	$ (47,641,451)	$ 21,571,451
Balance (in shares) at Dec. 31, 2016	19,158,417
Stock-based compensation		2,072,210		2,072,210
Exercise of warrants	$ 13	167,881		167,894
Exercise of warrants (in shares)	129,149
Issuance of common stock upon exercise of options	$ 9	316,710		316,719
Issuance of common stock upon exercise of options (in shares)	88,922
Issuance of common stock upon financing	$ 611	21,531,730		21,532,341
Issuance of common stock upon financing (in shares)	6,116,504
Net loss			(28,943,392)	(28,943,392)
Ending balance at Dec. 31, 2017	$ 2,549	93,299,517	(76,584,843)	16,717,223
Balance (in shares) at Dec. 31, 2017	25,492,992
Stock-based compensation		1,754,974		1,754,974
Exercise of warrants	$ 10	131,693		131,703
Exercise of warrants (in shares)	101,310
Issuance of common stock upon exercise of options	$ 29	380,293		380,322
Issuance of common stock upon exercise of options (in shares)	278,925
Issuance of warrants upon debt financing		37,842		37,842
Issuance of common stock upon financing	$ 421	12,880,900		12,881,321
Issuance of common stock upon financing (in shares)	4,213,986
Net loss			(30,965,464)	(30,965,464)
Ending 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			30,087,213
Stock-based compensation		6,115,160		$ 6,115,160
Exercise of warrants	$ 10	249,826		249,836
Exercise of warrants (in shares)	97,541
Issuance of common stock upon exercise of options	$ 25	1,143,816		$ 1,143,841
Issuance of common stock upon exercise of options (in shares)	252,773			252,773
Issuance of warrants upon debt financing		387,000		$ 387,000
Issuance of common stock upon financing	$ 649	238,233,168		238,233,817
Issuance of common stock upon financing (in shares)	6,495,690
Net loss			(68,345,186)	(68,345,186)
Ending 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