Quarterly report pursuant to Section 13 or 15(d)

Common Stock (Details 1)

v2.4.0.6
Common Stock (Details 1) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Summary of stock option activity    
Number of Shares, At December 31, 2012 2,519,070  
Number of Shares, Options granted 1,771,590  
Number of Shares, Options exercised (193,490)  
Number of Shares, Options Cancelled     
Number of Shares, At March 31, 2013 4,097,170 2,519,070
Number of Shares, Options vested and expected to vest 4,097,170  
Number of Shares, Options vested and exercisable 857,053  
Weighted Average Exercise Price, At December 31, 2012 $ 3.37  
Weighted Average Exercise Price, Options granted $ 5.66  
Weighted Average Exercise Price, Options exercised $ 1.37  
Weighted Average Exercise Price, Options cancelled     
Weighted Average Exercise Price, At March 31, 2013 $ 4.46 $ 3.37
Weighted Average Exercise Price, Options vested and expected to vest $ 4.46  
Weighted Average Exercise Price, Options vested and exercisable $ 2.75  
Total Weighted Average Intrinsic Value, At December 31, 2012 $ 2,860  
Total Weighted Average Intrinsic Value, At March 31, 2013 21,564 2,860
Total Weighted Average Intrinsic Value, Options vested and expected to vest 21,564  
Total Weighted Average Intrinsic Value, Options vested and exercisable $ 5,976  
Weighted Average Remaining Contractual Life, At December 31, 2012 8 years 11 months 19 days 8 years 6 months
Weighted Average Remaining Contractual Life, At March 31, 2013 8 years 11 months 19 days 8 years 6 months
Weighted Average Remaining Contractual Life, Options vested and expected to vest 8 years 11 months 19 days  
Weighted Average Remaining Contractual Life, Options vested and exercisable 8 years 18 days