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Stock Based Compensation (Tables)
6 Months Ended
Jun. 30, 2017
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 operations for the three and six months ended June 30, 2017 and 2016, respectively (in thousands):

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Research and development
$
35

 
$
108

 
$
73

 
$
235

General and administrative
162

 
514

 
352

 
1,043

Total stock-based compensation from continuing operations
$
197

 
$
622

 
$
425

 
$
1,278

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,
 
2017
 
2015*
 
2017
 
2016
Risk free interest rate
1.58
%
 
1.41
%
 
1.87
%
 
1.41
%
Volatility
132.13
%
 
76.30
%
 
116.41
%
 
75.63
%
Expected lives (years)
5.50

 
6.25

 
5.92

 
6.25

Expected dividend yield
%
 
%
 
%
 
%
Stock Option Activity
The following table summarizes stock option activity of the Company for the six months ended June 30, 2017:

 
Total
Number of
Shares
(In Thousands)
 
Weighted
Average
Exercise
Price
 
Aggregate
Intrinsic
Value
(In Thousands)
Outstanding at January 1, 2017
561

 
$
41.50

 


Granted
105

 
1.30

 


Exercised

 

 
$

Canceled
(161
)
 
34.21

 
$

Outstanding at June 30, 2017
505

 
$
35.49

 
$

Options exercisable at June 30, 2017
300

 
$
54.15

 
$