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Stockholders' Equity - Summary of Stock Options Outstanding (Detail) | 12 Months Ended
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Dec. 31, 2015 $ / shares shares
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 | shares | 8,177,368
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 6 years 6 months 22 days
Options Exercisable Number of Shares of common stock subject to options | shares | 4,950,680
Options Exercisable Weighted Average Exercise Price | $ 7.97
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 | $ 5.35
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 1,486,569
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 3 years 8 months 19 days
Options Exercisable Number of Shares of common stock subject to options | shares | 1,484,693
Options Exercisable Weighted Average Exercise Price | $ 4.35
Range 2 [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 | shares | 826,984
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 6 years 9 months 15 days
Options Exercisable Number of Shares of common stock subject to options | shares | 598,837
Options Exercisable Weighted Average Exercise Price | $ 5.41
Range 3 [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 | $ 5.94
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 1,001,858
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 5 years 26 days
Options Exercisable Number of Shares of common stock subject to options | shares | 1,001,858
Options Exercisable Weighted Average Exercise Price | $ 5.76
Range 4 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | 6.05
Upper Range of Exercise Price | $ 9.40
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 308,171
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 6 years 1 month 28 days
Options Exercisable Number of Shares of common stock subject to options | shares | 193,003
Options Exercisable Weighted Average Exercise Price | $ 7.00
Range 5 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | 9.41
Upper Range of Exercise Price | $ 9.41
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 1,229,402
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 9 years 11 months 9 days
Range 6 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 9.45
Upper Range of Exercise Price | $ 12.12
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 967,099
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 7 years 9 months 26 days
Options Exercisable Number of Shares of common stock subject to options | shares | 472,328
Options Exercisable Weighted Average Exercise Price | $ 11.87
Range 7 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | 12.23
Upper Range of Exercise Price | $ 13.99
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 702,135
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 4 years 3 months 22 days
Options Exercisable Number of Shares of common stock subject to options | shares | 521,809
Options Exercisable Weighted Average Exercise Price | $ 13.83
Range 8 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | 14.07
Upper Range of Exercise Price | $ 14.07
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 1,019,650
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 8 years 10 months 28 days
Options Exercisable Number of Shares of common stock subject to options | shares | 258,665
Options Exercisable Weighted Average Exercise Price | $ 14.07
Range 9 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | 14.15
Upper Range of Exercise Price | $ 19.80
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 629,500
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 5 years 7 months 28 days
Options Exercisable Number of Shares of common stock subject to options | shares | 416,862
Options Exercisable Weighted Average Exercise Price | $ 14.69
Range 10 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | 23.02
Upper Range of Exercise Price | $ 23.02
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 6,000
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 8 years 2 months 16 days
Options Exercisable Number of Shares of common stock subject to options | shares | 2,625
Options Exercisable Weighted Average Exercise Price | $ 23.02

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