Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Stock Option Activity (Detail)

v2.4.0.8
Common Stock - Stock Option Activity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Number of Shares, At December 31, 2013 3,117,777  
Number of Shares, Options granted 0  
Number of Shares, Options exercised (323,412)  
Number of Shares, Options cancelled (630,000)  
Number of Shares, At June 30, 2014 2,164,365 3,117,777
Number of Shares, Options vested and expected to vest 2,164,365  
Number of Shares, Options vested and exercisable 1,587,699  
Weighted Average Exercise Price, At December 31, 2013 $ 4.31  
Weighted Average Exercise Price, Options granted $ 0  
Weighted Average Exercise Price, Options exercised $ 1.84  
Weighted Average Exercise Price, Options cancelled $ 4.28  
Weighted Average Exercise Price, At June 30, 2014 $ 4.69 $ 4.31
Weighted Average Exercise Price, Options vested and expected to vest $ 4.69  
Weighted Average Exercise Price, Options vested and exercisable $ 4.42  
Weighted Average Remaining Contractual Life 7 years 10 months 20 days 8 years 4 months 10 days
Weighted Average Remaining Contractual Life, Options vested and expected to vest 7 years 10 months 20 days  
Weighted Average Remaining Contractual Life, Options vested and exercisable 7 years 7 months 13 days