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
 3 Months Ended
Mar. 31, 2014
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 (256,745)
Number of Shares, Options cancelled (600,000)
Number of Shares, At March 31, 2014 2,261,032
Number of Shares, Options vested and expected to vest 2,261,032
Number of Shares, Options vested and exercisable 1,492,699
Weighted Average Exercise Price, At December 31, 2013 $ 4.31
Weighted Average Exercise Price, Options granted $ 0
Weighted Average Exercise Price, Options exercised $ 1.88
Weighted Average Exercise Price, Options cancelled $ 4.39
Weighted Average Exercise Price, At March 31, 2014 $ 4.57
Weighted Average Exercise Price, Options vested and expected to vest $ 4.57
Weighted Average Exercise Price, Options vested and exercisable $ 4.24
Total Weighted Average Intrinsic Value, Options exercised $ 26
Weighted Average Remaining Contractual Life, At December 31, 2013 8 years 4 months 10 days
Weighted Average Remaining Contractual Life, At March 31, 2014 8 years 2 months 12 days
Weighted Average Remaining Contractual Life, Options vested and expected to vest 8 years 2 months 12 days
Weighted Average Remaining Contractual Life, Options vested and exercisable 7 years 9 months 25 days