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Warrants (Tables)
6 Months Ended
Jun. 30, 2019
Common Stock [Member]  
Class Of Warrant Or Right [Line Items]  
Components of Warrants Outstanding

As of June 30, 2019, outstanding warrants to purchase common stock were:

 

 

 

 

Classified as

 

Original Term

 

Exercise Price

 

 

Number of Shares

Underlying

Warrants

 

Original issue date:

 

 

 

 

 

 

 

 

 

 

 

 

August 2012

 

Equity

 

7 years

 

$

21.78

 

 

 

111,455

 

January 2015

 

Equity

 

5 years

 

$

6.96

 

 

 

34,483

 

April 2016

 

Liability

 

7 years

 

$

1.12

 

 

 

320,757

 

 

 

 

 

 

 

 

 

 

 

 

466,695