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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Components of Stock-based Compensation Expense
The following table summarizes the components of stock-based compensation expense in the Consolidated Statements of Comprehensive Loss for the years ended December 31, 2013, 2012, and 2011 (in thousands):

 
2013
 
2012
 
2011
Research and development
$
754

 
$
580

 
$
139

Selling, general, and administrative
2,150

 
1,179

 
2,386

Total stock-based compensation
$
2,904

 
$
1,759

 
$
2,525
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:
 
 
2013
 
2012
Risk free interest rate
1.57
%
 
1.05
%
Volatility
77.98
%
 
75.76
%
Expected lives (years)
6.25

 
6.13

Expected dividend yield
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
Outstanding at December 31, 2012
7,672

 
$
2.54

Granted
7,113

 
2.87

Exercised
(289
)
 
1.21

Cancelled
(1,337
)
 
2.80

Outstanding at December 31, 2013
13,159

 
$
2.73

Options exercisable at December 31, 2013
6,557

 
$
2.63