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Stock Plans (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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| Summary of share-based compensation expense recorded for awards under the stock option plans | ||||
| Total stock-based compensation expenses | $ 130 | $ 316 | $ 635 | $ 1,868 |
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Research and development [Member]
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| Summary of share-based compensation expense recorded for awards under the stock option plans | ||||
| Total stock-based compensation expenses | 52 | 114 | 356 | 730 |
|
General and administrative [Member]
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| Summary of share-based compensation expense recorded for awards under the stock option plans | ||||
| Total stock-based compensation expenses | $ 78 | $ 202 | $ 279 | $ 1,138 |