Annual report pursuant to Section 13 and 15(d)

Stock Plans and Stock-Based Compensation - Stock Option Activity (Detail)

v2.4.0.8
Stock Plans and Stock-Based Compensation - Stock Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Number of shares,Outstanding at December 31, 2012 2,519,070  
Number of Shares, Options granted 2,466,590  
Number of Shares, Options exercised (550,157)  
Number of Shares,Options cancelled/forfeited (1,317,726)  
Number of Shares, Outstanding at December 31, 2013 3,117,777 2,519,070
Number of Shares, Options vested and expected to vest 3,117,777  
Number of Shares, Options vested and exercisable 2,169,444  
Weighted Average Exercise Price,Outstanding at December 31, 2012 $ 3.37  
Weighted Average Exercise Price, Options granted $ 5.34  
Weighted Average Exercise Price, Options exercised $ 1.76  
Weighted Average Exercise Price,Options cancelled/forfeited $ 5.51  
Weighted Average Exercise Price, Outstanding at December 31, 2013 $ 4.31 $ 3.37
Weighted Average Exercise Price, Options vested and expected to vest $ 4.31  
Weighted Average Exercise Price, Options vested and exercisable $ 3.75  
Total Weighted Average Intrinsic Value,Outstanding at December 31, 2012 $ 2,860  
Total Weighted Average Intrinsic Value,Options ecercised 478  
Total Weighted Average Intrinsic Value,Outstanding at December 31, 2013 0 2,860
Total Weighted Average Intrinsic Value, Options vested and expected to vest 0  
Total Weighted Average Intrinsic Value, Options vested and exercisable $ 0  
Weighted Average Remaining Contractual Life,Outstanding 8 years 4 months 10 days 8 years 6 months 14 days
Weighted Average Remaining Contractual Life, Options vested and expected to vest 8 years 4 months 10 days  
Weighted Average Remaining Contractual Life, Options vested and exercisable 7 years 10 months 13 days