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Stock Based Compensation (Tables)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
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 months and nine months ended September 30, 2014 and 2013, respectively (in thousands):

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Research and development
$
92

 
$
133

 
$
439

 
$
391

Selling, general, and administrative
1,208

 
328

 
3,997

 
953

Total stock-based compensation
$
1,300

 
$
461

 
$
4,436

 
$
1,344

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 September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Risk free interest rate
2.02
%
 
%
 
2.02
%
 
1.25
%
Volatility
79.10
%
 
%
 
79.47
%
 
77.66
%
Expected lives (years)
6.12

 
0

 
6.15

 
6.25

Expected dividend yield
0.00
%
 
0.00
%
 
0.00
%
 
0.00
%
 
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, 2014
13,159

 
$
2.73

 
$

Granted
1,235

 
2.57

 

Exercised
(3,608
)
 
1.31

 
13,429

Cancelled
(1,792
)
 
2.42

 
562

Outstanding at September 30, 2014
8,994

 
$
3.34

 
$
1,551

Options exercisable at September 30, 2014
5,225

 
$
3.68

 
$
1,088