Organization and Nature of Business (Details)				3 Months Ended						9 Months Ended
	Sep. 13, 2021 USD ($) $ / shares shares	Feb. 16, 2021 $ / shares shares	Feb. 11, 2021 shares	Sep. 30, 2021 USD ($) segment	Jun. 30, 2021 USD ($) segment	Mar. 31, 2021 USD ($) segment	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Related Party Transaction [Line Items]
Number of reportable segments | segment				3	3	1
Working capital deficiency				$ 96,800,000						$ 96,800,000
Cash and cash equivalents				66,785,000						66,785,000		$ 17,996,000
Short-term investments				43,223,000						43,223,000		$ 7,998,000
Net loss				$ (33,949,000)	$ 14,506,000	$ (12,539,000)	$ (7,451,000)	$ (7,303,000)	$ (6,168,000)	(31,982,000)	$ (20,919,000)
Number of common shares sold under offering (in shares) | shares		15,800,000	3,000,000
Warrants granted (in shares) | shares		44,305,088
Net proceeds from issuance of common stock and warrants										77,853,000	44,041,000
Net proceeds from issuance of preferred stock and warrants	$ 50,600,000									$ 50,584,000	$ 0
Registered Direct Offering
Related Party Transaction [Line Items]
Subscription price (in usd per share) | $ / shares	$ 920
Original issuance discount percentage	8.00%
Aggregate subscription value	$ 54,050,000
Minimum
Related Party Transaction [Line Items]
Warrant exercise price (in usd per share) | $ / shares		$ 1.55
Purchase price per unit (in usd per share) | $ / shares		1.549
Maximum
Related Party Transaction [Line Items]
Warrant exercise price (in usd per share) | $ / shares		2.01
Purchase price per unit (in usd per share) | $ / shares		$ 2.009
Purchase Agreement
Related Party Transaction [Line Items]
Warrants granted (in shares) | shares		28,505,088
Purchase price per unit (in usd per share) | $ / shares		$ 0.001
Warrants | Registered Direct Offering
Related Party Transaction [Line Items]
Number of common shares sold under offering (in shares) | shares	47,000,000