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Equity Incentive Plans - Summary of Stock Option Activity (Detail) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
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12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Share Based Compensation Arrangement By Share Based Payment Award Options Activity [Abstract] |
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| Number of Shares Outstanding, Beginning Balance |
8,207 |
7,205 |
7,856 |
| Number of Shares Granted, Shares |
2,815 |
2,592 |
260 |
| Number of Shares Exercised, Shares |
(1,683) |
(50) |
(25) |
| Number of Shares Forfeited or cancelled, Shares |
(1,622) |
(1,540) |
(886) |
| Number of Shares Outstanding, Ending Balance |
7,717 |
8,207 |
7,205 |
| Weighted-Average Exercise Price, Beginning Balance |
$ 4.55 |
$ 6.68 |
$ 7.12 |
| Number of Share Exercisable |
3,611 |
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| Weighted-Average Exercise Price, Granted |
$ 2.18 |
$ 1.64 |
$ 2.03 |
| Number of Shares Expected to vest |
4,106 |
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| Weighted-Average Exercise Price, Exercised |
$ 1.67 |
$ 0.46 |
$ 1.73 |
| Weighted-Average Exercise Price, Forfeited or cancelled |
$ 5.70 |
$ 9.72 |
$ 9.39 |
| Weighted-Average Exercise Price, Ending Balance |
$ 4.05 |
$ 4.55 |
$ 6.68 |
| Weighted-Average Exercise Price Exercisable |
$ 6.38 |
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| Weighted-Average Exercise Price Expected to Vest |
$ 2.01 |
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| Weighted-Average Remaining Contractual Life (Years) |
6 years 29 days |
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| Weighted-Average Remaining Contractual Life (Years), Exercisable |
2 years 11 months 16 days |
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| Weighted-Average Remaining Contractual Life (Years), Expected to Vest |
8 years 10 months 10 days |
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| Aggregate Intrinsic Value, Exercised |
$ 4,965 |
$ 45 |
$ 14 |
| Aggregate Intrinsic Value |
22,023 |
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| Aggregate Intrinsic Value, Exercisable |
5,346 |
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| Aggregate Intrinsic Value Expected to Vest |
$ 16,744 |
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