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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Data [Abstract]  
Summary of the Quarterly Results of Operations
The following is a summary of the quarterly results of operations of the Company for years ended December 31, 2016 and 2015:
 
 
Quarter Ended(1)
 
March 31
 
June 30
 
September 30
 
December 31
 
(dollars in thousands, except per share data)
2016
 

 
 

 
 

 
 

Revenues
$
120

 
$
104

 
$
89

 
$
68

Operating expenses
$
10,579

 
$
10,084

 
$
10,013

 
$
9,850

 
 
 
 
 
 
 
 
Net loss attributable to common stockholders
$
(10,269
)
 
$
(10,208
)
 
$
(10,197
)
 
$
(8,554
)
Net loss per common share - basic
$
(0.35
)
 
$
(0.34
)
 
$
(0.34
)
 
$
(0.28
)
Net loss per common share - diluted
$
(0.36
)
 
$
(0.34
)
 
$
(0.34
)
 
$
(0.34
)
 
 
 
 
 
 
 
 
Shares used in the calculation of net loss attributable to common stockholders - basic
29,755,184

 
29,958,037

 
30,339,774

 
30,639,440

Shares used in the calculation of net loss attributable to common stockholders - diluted
30,108,377

 
29,958,037

 
30,339,774

 
30,711,946

 
 
 
 
 
 
 
 
2015
 

 
 

 
 

 
 

Revenues
$
127

 
$
49

 
$
58

 
$
79

Operating expenses
$
4,975

 
$
6,682

 
$
6,467

 
$
7,463

Net loss attributable to common stockholders
$
(7,180
)
 
$
(10,186
)
 
$
(2,742
)
 
$
(7,387
)
Net loss per common share - basic
$
(0.33
)
 
$
(0.41
)
 
$
(0.10
)
 
$
(0.25
)
Net loss per common share - diluted
$
(0.33
)
 
$
(0.41
)
 
$
(0.23
)
 
$
(0.26
)
 
 
 
 
 
 
 
 
Shares used in the calculation of net loss attributable to common stockholders - basic
21,817,710

 
24,592,883

 
28,560,211

 
29,723,254

Shares used in the calculation of net loss attributable to common stockholders - diluted
21,817,710

 
24,592,883

 
29,128,235

 
30,157,038


 
(1) Basic and diluted net loss per common share are computed independently for each of the periods presented. Accordingly, the sum of the quarterly net loss per common share amount may not agree to the total for the year.