Organization and Nature of Business (Details) - USD ($)								3 Months Ended		12 Months Ended
	Feb. 16, 2021	Feb. 12, 2021	Feb. 11, 2021	Jan. 24, 2021	Nov. 25, 2020	Jun. 19, 2020	Mar. 03, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Working capital deficiency								$ 88,900,000
Cash and cash equivalents								46,273,000		$ 17,996,000
Net loss								$ 12,539,000	$ 6,168,000
Number of common shares sold under offering (in shares)			3,000,000
Shares issued for registered offering (in shares)								4,977
Exercise price of warrants (in usd per share)								$ 0.001
Proceeds from warrant exercises	$ 18,500,000	$ 27,800,000		$ 27,800,000
Purchase Warrants
Related Party Transaction [Line Items]
Exercisable warrants per common share (in shares)	1	1		1
ATM
Related Party Transaction [Line Items]
Aggregate offering amount under ATM public offering						$ 150,000,000	$ 50,000,000
Number of common shares sold under offering (in shares)										33,416,830
Net proceeds from public offering										$ 46,100,000
Purchase Agreement
Related Party Transaction [Line Items]
Number of common shares sold under offering (in shares)					5,000,000
Warrant exercise price (in usd per share)					$ 1.25
Warrants granted (in shares)					8,000,000
Purchase price per unit (in usd per share)					$ 1.25
2020 Pre-Funded Warrant
Related Party Transaction [Line Items]
Net proceeds from public offering					$ 9,200,000
Warrant exercise price (in usd per share)					$ 0.001
Warrants granted (in shares)					3,000,000
Purchase price per unit (in usd per share)					$ 1.249
Warrant
Related Party Transaction [Line Items]
Warrants to purchase shares of common stock after adjustment	9,950,250	15,000,000		19,354,838
Exercise price of warrants (in usd per share)								$ 0.001
Warrant | Purchase Warrants
Related Party Transaction [Line Items]
Exercise price of warrants (in usd per share)	$ 2.01	$ 2.00		$ 1.55
Offering price (in usd per share)	$ 2.01	$ 2.00		$ 1.55
Warrant | Registered Direct Offering
Related Party Transaction [Line Items]
Shares issued for registered offering (in shares)	3,000,000	7,000,000		5,800,000
January 2021 Pre-Funded Warrants
Related Party Transaction [Line Items]
Warrants to purchase shares of common stock after adjustment				13,554,838
Exercise price of warrants (in usd per share)				$ 0.001
Offering price (in usd per share)				$ 1.549
Exercisable warrants per common share (in shares)				1
Warrants exercisable period				5 years
February 2021 Pre-Funded Warrants
Related Party Transaction [Line Items]
Warrants to purchase shares of common stock after adjustment		8,000,000
Exercise price of warrants (in usd per share)		$ 0.001
Offering price (in usd per share)		$ 1.999
Exercisable warrants per common share (in shares)		1
Warrants exercisable period		5 years
Second February 2021 Pre-Funded Warrants
Related Party Transaction [Line Items]
Warrants to purchase shares of common stock after adjustment	6,950,250
Exercise price of warrants (in usd per share)	$ 0.001
Offering price (in usd per share)	$ 2.009
Exercisable warrants per common share (in shares)	1
Warrants exercisable period	5 years