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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Selected Quarterly Financial Information [Abstract]  
Schedule of Selected Quarterly Results from Operations

Selected quarterly results from operations for the years ended December 31, 2015 and 2014 are as follows (in thousands, except per share amounts):

 

2015 Quarter End

 

 

March 31,

 

 

June 30,

 

 

September 30,

 

 

December 31,

 

Operating expenses

$

7,867

 

 

$

7,874

 

 

$

8,950

 

 

$

8,128

 

Net loss

 

(7,858

)

 

 

(7,818

)

 

 

(8,900

)

 

 

(8,068

)

Basic and diluted net loss per common share

$

(0.44

)

 

$

(0.44

)

 

$

(0.49

)

 

$

(0.44

)

 

 

2014 Quarter End

 

 

March 31,

 

 

June 30,

 

 

September 30,

 

 

December 31,

 

Operating expenses

$

4,150

 

 

$

5,492

 

 

$

5,241

 

 

 

6,838

 

Net loss

 

(4,149

)

 

 

(5,491

)

 

 

(5,239

)

 

 

(6,833

)

Basic and diluted net loss per common share

$

(22.80

)

 

$

(24.22

)

 

$

(16.85

)

 

$

(0.39

)