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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2019
Stockholders' Equity [Abstract]  
Summary of Warrant Information



At March 31, 2019 outstanding warrants to purchase shares of common stock, accounted for as equity or liabilities, are as follows:







 

 

 

 

 



 

 

 

 

 

Shares Underlying

 

 

 

 

Outstanding

 

Exercise

 

Expiration

Warrants

 

Price

 

Date



 

 

 

 

 

 41,872

 

$

107.50 

 

March 16, 2020

 31,519

 

$

40.50 

 

March 31, 2021

 106,381

 

$

22.50 

 

June 3, 2021

 168,498

 

$

0.32 

(1)

November 22, 2021

 7,920,933

 

$

1.50 

 

May 10, 2022

 17,500,000

 

$

0.40 

 

October 16, 2023

 694,318

(2)

$

0.01 

 

October 16, 2023

 16,984

 

$

120.00 

 

None

 26,480,505