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Stockholders' Equity - Summary of Stock Options Outstanding (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding and Exercisable Number of Shares of common stock subject to options 8,405,864
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) 6 years 3 months 4 days
Options Exercisable Number of Shares of common stock subject to options 5,800,931
Options Exercisable Weighted Average Exercise Price $ 6.84
Range 1 [Member]
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower Range of Exercise Price $ 2.55
Upper Range of Exercise Price $ 3.25
Options Outstanding and Exercisable Number of Shares of common stock subject to options 212,844
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) 7 years 9 months 7 days
Options Exercisable Number of Shares of common stock subject to options 59,647
Options Exercisable Weighted Average Exercise Price $ 2.57
Range 2 [Member]
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower Range of Exercise Price $ 3.45
Upper Range of Exercise Price $ 3.45
Options Outstanding and Exercisable Number of Shares of common stock subject to options 1,124,381
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) 4 years 11 months 9 days
Options Exercisable Number of Shares of common stock subject to options 1,124,381
Options Exercisable Weighted Average Exercise Price $ 3.45
Range 3 [Member]
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower Range of Exercise Price $ 3.80
Upper Range of Exercise Price $ 5.26
Options Outstanding and Exercisable Number of Shares of common stock subject to options 661,565
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) 3 years 3 months 29 days
Options Exercisable Number of Shares of common stock subject to options 596,146
Options Exercisable Weighted Average Exercise Price $ 4.54
Range 4 [Member]
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower Range of Exercise Price $ 5.35
Upper Range of Exercise Price $ 5.35
Options Outstanding and Exercisable Number of Shares of common stock subject to options 909,866
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) 5 years 11 months 1 day
Options Exercisable Number of Shares of common stock subject to options 909,866
Options Exercisable Weighted Average Exercise Price $ 5.35
Range 5 [Member]
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower Range of Exercise Price $ 5.41
Upper Range of Exercise Price $ 5.41
Options Outstanding and Exercisable Number of Shares of common stock subject to options 1,134,524
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) 8 years 10 months 21 days
Options Exercisable Number of Shares of common stock subject to options 270,040
Options Exercisable Weighted Average Exercise Price $ 5.41
Range 6 [Member]
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower Range of Exercise Price $ 5.42
Upper Range of Exercise Price $ 5.66
Options Outstanding and Exercisable Number of Shares of common stock subject to options 60,500
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) 5 years 2 months 27 days
Options Exercisable Number of Shares of common stock subject to options 60,500
Options Exercisable Weighted Average Exercise Price $ 5.46
Range 7 [Member]
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower Range of Exercise Price $ 5.70
Upper Range of Exercise Price $ 5.70
Options Outstanding and Exercisable Number of Shares of common stock subject to options 945,120
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) 6 years 11 months 5 days
Options Exercisable Number of Shares of common stock subject to options 676,970
Options Exercisable Weighted Average Exercise Price $ 5.70
Range 8 [Member]
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower Range of Exercise Price $ 5.86
Upper Range of Exercise Price $ 6.82
Options Outstanding and Exercisable Number of Shares of common stock subject to options 899,022
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) 5 years 1 month 13 days
Options Exercisable Number of Shares of common stock subject to options 749,020
Options Exercisable Weighted Average Exercise Price $ 6.45
Range 9 [Member]
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower Range of Exercise Price $ 6.92
Upper Range of Exercise Price $ 11.99
Options Outstanding and Exercisable Number of Shares of common stock subject to options 365,342
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) 5 years 5 months 1 day
Options Exercisable Number of Shares of common stock subject to options 267,361
Options Exercisable Weighted Average Exercise Price $ 8.68
Range 10 [Member]
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower Range of Exercise Price $ 12.12
Upper Range of Exercise Price $ 14.62
Options Outstanding and Exercisable Number of Shares of common stock subject to options 2,092,700
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) 6 years 9 months 29 days
Options Exercisable Number of Shares of common stock subject to options 1,087,000
Options Exercisable Weighted Average Exercise Price $ 14.05