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Stock Based Compensation (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||||||||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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| Stock-based compensation [Line Items] | ||||||||||
| Stock-based compensation expense included in operating expense | $ 108,000 | $ 242,000 | $ 222,000 | $ 423,000 | ||||||
| Stock options granted (in shares) | 510,000 | 475,000 | 510,000 | 575,000 | ||||||
| Weighted average Black-Scholes fair value assumptions used to value grants [Abstract] | ||||||||||
| Expected life | 5 years 6 months | [1] | 6 years 15 days | [1] | ||||||
| Risk free interest rate (in hundredths) | 0.60% | 2.00% | ||||||||
| Expected volatility (in hundredths) | 96.00% | [2] | 119.00% | [2] | ||||||
| Expected dividend yield (in hundredths) | 0.00% | 0.00% | ||||||||
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Research and development [Member]
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| Stock-based compensation [Line Items] | ||||||||||
| Stock-based compensation expense included in operating expense | 33,000 | 92,000 | 74,000 | 179,000 | ||||||
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Selling, general and administrative [Member]
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| Stock-based compensation [Line Items] | ||||||||||
| Stock-based compensation expense included in operating expense | $ 75,000 | $ 150,000 | $ 148,000 | $ 244,000 | ||||||
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