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Common Stock - Employee Stock Purchase Programs (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Total stock-based compensation expense | $ 1,463 | $ 1,283 | $ 2,598 | $ 2,806 |
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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 | 1,452 | 1,044 | 2,574 | 2,016 |
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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 | 11 | 218 | 24 | 652 |
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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 | $ 21 | $ 0 | $ 138 |