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Preferred and Common Stock Warrants (Tables)
 12 Months Ended
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Outstanding Warrants Table The following table provides a roll forward of outstanding warrants for the three year period ended December 31, 2020:

Number of warrants

Weighted
Average
Exercise
Price

Weighted
Average
Contractual
Term (Years)
Outstanding and exercisable warrants to purchase shares preferred stock as of 12/31/20185,146,400 

$— 

4.2
Conversion of warrants to purchase preferred shares to warrants for the
purchase of common stock and adjusted for the Exchange Ratio and Reverse Stock Split		(4,657,350)




Issuance of warrants for the purchase of common stock or prefunded warrants to purchase common stock13,201,667 



Exercised(33,846)



Outstanding and exercisable as of December 31, 201913,656,871 

$13.68 

4.6
Expired (302,468)
Outstanding and exercisable as of December 31, 202013,354,403$13.52 3.7
Schedule of Stockholders' Equity Note, Warrants or Rights
As of December 31, 2020, the Company’s outstanding warrants to purchase shares of common stock consisted of the following:
Issuance Date

Number of
Shares of
Common
Stock Issuable

Exercise
Price

Expiration Date
October 25, 20165,155 

$19.78 

October 24, 2026
December 28, 2017115,916 

$19.78 

December 28, 2027
September 12, 201825,275 

$19.78 

September 12, 2021
September 12, 201820,220 

$19.78 

September 12, 2028
October 19, 201820,016 

$19.78 

October 19, 2028
March 13, 20195,000 

$19.78 

March 12, 2029
April 16, 20193,866,154 

$13.20 

April 15, 2024
April 16, 20192,130,000 

$11.00 
(a)
n/a
November 29, 20195,416,667 $15.00 November 28, 2024
November 29, 20191,750,000 $12.00 (b)n/a

13,354,403 


(a) In April 2019, the Company received $10.999 per pre-funded warrant, or $23.4 million in aggregate proceeds. Each pre-funded warrant may be exercised for an additional $0.001 per pre-funded warrant.
(b) In November 2019, the Company received $11.999 per pre-funded warrant, or $21.0 million in aggregate proceeds. Each pre-funded warrant may be exercised for an additional $0.001 per pre-funded warrant.