Fair Value Measurements. (Details) - Schedule of fair value of pre-funded warrants and other warrants $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares
Pre-funded Warrant [Member]
Fair Value Measurements. (Details) - Schedule of fair value of pre-funded warrants and other warrants [Line Items]
Valuation Date	Oct. 28, 2020
Exercise Price (in Dollars per share) | $ / shares	$ 0.01
Volatility	97.00%
Risk Free Interest Rate	0.34%
Term (years)	5 years
Fair Value (in Dollars) | $	$ 23,638
Other Warrant [Member]
Fair Value Measurements. (Details) - Schedule of fair value of pre-funded warrants and other warrants [Line Items]
Valuation Date	Oct. 28, 2020
Exercise Price (in Dollars per share) | $ / shares	$ 9.76
Volatility	134.00%
Risk Free Interest Rate	0.14%
Term (years)	1 year 6 months
Fair Value (in Dollars) | $	$ 27,048
Pre-funded Warrant [Member]
Fair Value Measurements. (Details) - Schedule of fair value of pre-funded warrants and other warrants [Line Items]
Valuation Date	Nov. 16, 2020
Exercise Price (in Dollars per share) | $ / shares	$ 0.01
Volatility	97.00%
Risk Free Interest Rate	0.40%
Term (years)	4 years 346 days
Fair Value (in Dollars) | $	$ 21,916
Other Warrant [Member]
Fair Value Measurements. (Details) - Schedule of fair value of pre-funded warrants and other warrants [Line Items]
Valuation Date	Nov. 24, 2020
Exercise Price (in Dollars per share) | $ / shares	$ 9.76
Volatility	135.00%
Risk Free Interest Rate	0.13%
Term (years)	1 year 164 days
Fair Value (in Dollars) | $	$ 31,231