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Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2012
Accounting Policies [Abstract]  
Property, Plant and Equipment [Table Text Block]
Depreciation and amortization is computed using the straight-line method and half-year convention over the estimated useful lives of the assets as follows:
Equipment
3 years
Furniture and fixtures
5 - 10 years
Software
3 years
Leasehold improvements
3 years
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The Company used the following assumptions for options granted under the 2007 and the 2011 Equity Incentive Plans during the three and six months ended June 30, 2012 and 2011:

 
Three Months Ended
 
Six Months Ended
2007 Equity Incentive Plan Assumptions
June 30,
2012
 
June 30,
2011
 
June 30,
2012
 
June 30,
2011
Expected term
n/a
 
5 years
 
n/a
 
5 years
Weighted average volatility
n/a
 
55.08%
 
n/a
 
54.96%
Weighted average risk free interest rate
n/a
 
1.89%
 
n/a
 
2.36%
Expected dividends
n/a
 
 
n/a
 

 
Three Months Ended
 
Six Months Ended
2011 Equity Incentive Plan Assumptions
June 30,
2012
 
June 30,
2011
 
June 30,
2012
 
June 30,
2011
Expected term
5 years
 
5 years
 
5 years
 
5 years
Weighted average volatility
54.93%
 
55.08%
 
54.93%
 
55.08%
Weighted average risk free interest rate
0.76%
 
1.88%
 
0.76%
 
1.88%
Expected dividends