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Common Stock - Employee Stock Purchase Programs (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Total stock-based compensation expense | $ 1,484 | $ 1,266 | $ 4,082 | $ 4,072 |
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Employee Awards [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Total stock-based compensation expense | 1,460 | 1,158 | 4,035 | 3,174 |
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Non-Employee Awards [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Total stock-based compensation expense | 24 | 106 | 47 | 758 |
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Non-Employee Warrants [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Total stock-based compensation expense | $ 0 | $ 2 | $ 0 | $ 140 |