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Stock Incentive Plan - Schedule of Stock Based Compensation Allocated to Expense (Detail) (USD $)
In Thousands, unless otherwise specified |
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 [Line Items] | |||
| Stock based compensation expense | $ 19,714 | $ 14,792 | $ 8,925 |
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Cost of Revenue [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Stock based compensation expense | 706 | 484 | 316 |
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Research and Development [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Stock based compensation expense | 3,761 | 2,826 | 1,477 |
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Sales and Marketing [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Stock based compensation expense | 7,242 | 4,962 | 2,700 |
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General and Administrative [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Stock based compensation expense | $ 8,005 | $ 6,520 | $ 4,432 |