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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Reconciliation of Transactions Under the ATM and Purchase Agreement
Following is a reconciliation of the transactions under the ATM Agreement, 2017 Sales Agreement and the 2018 Sales Agreement for three months ended March 31, 2019, and 2018, respectively:
 
Three Months Ended
 
Three Months Ended
 
March 31, 2019
 
March 31, 2018
Number of shares sold
5,452,000

 
4,679,904

 
 
 
 
Gross proceeds
$
813,561

 
$
1,385,452

Fees
85,093

 
252,568

Net proceeds
$
728,468

 
$
1,132,884

 
 
 
 
Average price per share
$
0.15

 
$
0.30