Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation, Employee Benefit Plans and Convertible Preferred Stock - Summary of Company's Stock Option Activity (Detail)

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Stock-Based Compensation, Employee Benefit Plans and Convertible Preferred Stock - Summary of Company's Stock Option Activity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Schedule Of Stock Option Activity [Line Items]  
Number of Options, Outstanding, Beginning Balance 4,666
Number of Options, Granted 1,285
Number of Options, Exercised (521)
Number of Options, Canceled (2,236)
Number of Options, Outstanding, Ending Balance 3,194
Number of Options, Vested and expected to vest, Ending Balance 3,168
Number of Options, Exercisable, Ending Balance 1,516
Outstanding, Weighted-Average Exercise Price, Beginning Balance $ 6.73
Outstanding, Weighted-Average Exercise Price, Granted $ 5.01
Outstanding, Weighted-Average Exercise Price, Exercised $ 1.55
Outstanding, Weighted-Average Exercise Price, Canceled $ 9.70
Outstanding, Weighted-Average Exercise Price, Ending Balance $ 4.81
Weighted-Average Exercise Price, Vested and expected to vest, Ending Balance $ 4.80
Exercisable, Weighted-Average Exercise Price, Ending Balance $ 4.02
Outstanding, Weighted-Average Contractual Term (in Years), Ending Balance 6 years 2 months 12 days
Vested and expected to vest, Weighted-Average Contractual Term (in Years), Ending Balance 6 years 2 months 12 days
Exercisable, Weighted-Average Contractual Term (in Years), Ending Balance 5 years 7 months 6 days
Outstanding, Aggregate Intrinsic Value, Ending Balance $ 3,214
Vested and expected to vest, Aggregate Intrinsic Value, Ending Balance 3,210
Exercisable, Aggregate Intrinsic Value, Ending Balance $ 2,991