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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Reconciliation of Transactions Under the ATM and Purchase Agreement
Following is a reconciliation of the transactions under the ATM Agreement and Purchase Agreement for the six-month periods ended June 30, 2018, and 2017, respectively:

 
Six Months Ended
 
Six Months Ended
 
June 30, 2018
 
June 30, 2017
Number of shares sold
6,429,299

 
3,292,161

 
 
 
 
Gross proceeds
$
1,795,860

 
$
2,670,253

Fees
52,842

 
74,821

Net proceeds
$
1,743,018

 
$
2,595,432

 
 
 
 
Average price per share
$
0.28

 
$
0.81