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Public Offerings of Common Stock (Tables)
 9 Months Ended
Sep. 30, 2016
Text Block [Abstract]  
Schedule of Total Sales under 2015 and 2016 Sales Agreement

The following table summarizes the total sales under the 2015 Sales Agreement and 2016 Sales Agreement for the periods indicated (in thousands, except per share amounts):

 

 

 

2015 Sales

Agreement

 

 

2016 Sales

Agreement

 

 

 

Nine Months Ended

September 30,

2016

 

 

Year Ended

December 31,

2015

 

 

Nine Months Ended

September 30,

2016

 

Total shares of common stock sold

 

 

5,710.2

 

 

 

2,014.3

 

 

 

8,763.4

 

Average price per share

 

$

3.23

 

 

$

3.25

 

 

$

4.70

 

Gross proceeds

 

$

18,454

 

 

$

6,546

 

 

$

41,156

 

Commissions earned by Cantor

 

$

553

 

 

$

197

 

 

$

1,235

 

Other issuance costs

 

$

—

 

 

$

259

 

 

$

185