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Stock Based Compensation (Tables)
6 Months Ended
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Allocated Stock-based Compensation Expense
The following table summarizes the components of stock-based compensation expense in the condensed consolidated statements of comprehensive loss for the three and six months ended June 30, 2016 and 2015, respectively (in thousands):

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Research and development
$
108

 
$
93

 
$
235

 
$
170

General and administrative
514

 
296

 
1,043

 
590

Total stock-based compensation from continuing operations
$
622

 
$
389

 
$
1,278

 
$
760

Assumptions for Option Grants Issued
The Company uses the Black-Scholes option-pricing model and the following weighted-average assumptions to determine the fair value of all its stock options granted:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Risk free interest rate
1.41
%
 
1.69
%
 
1.41
%
 
1.50
%
Volatility
76.30
%
 
73.32
%
 
75.63
%
 
74.20
%
Expected lives (years)
6.25

 
5.76

 
6.25

 
6.09

Expected dividend yield
%
 
%
 
%
 
%
Stock Option Activity
The following table summarizes option activity of the Company:

 
Total
Number of
Shares
(In Thousands)
 
Weighted
Average
Exercise
Price
 
Aggregate
Intrinsic
Value
(In Thousands)
Outstanding at January 1, 2016
13,262

 
$
2.58

 


Granted
166

 
1.27

 


Exercised
(167
)
 
1.57

 
$
56

Canceled
(2,952
)
 
3.07

 
$

Outstanding at June 30, 2016
10,309

 
$
2.44

 
$

Options exercisable at June 30, 2016
5,970

 
$
2.97

 
$