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Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2019
Stockholders' Equity [Abstract]  
Summary of Warrant Information

At September 30, 2019, outstanding warrants to purchase shares of common stock are as follows:

 

 

 

 

 

 

 

Shares Underlying

 

 

 

 

 

Outstanding

 

Exercise

 

Expiration

Warrants

    

Price

    

Date

2,980

 

$

1,505.00

 

March 16, 2020

2,246

 

$

567.00

 

March 31, 2021

597,881

 

$

21.00

 

May 10, 2022

1,249,955

 

$

5.60

 

October 16, 2023

1,200

 

$

1,680.00

 

None

1,854,262