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Organization and Summary of Significant Accounting Policies (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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Dec. 31, 2011
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| Organization and Summary of Significant Accounting Policies (Textual) [Abstract] | |||||
| Employee Stock Based Compensation Costs | $ 658,000 | $ 571,000 | $ 1,298,000 | $ 1,129,000 | |
| Shares of common stock issued | 36,224 | 144,979 | |||
| Stock option modification expense | 12,000 | 28,000 | 154,000 | ||
| Non-employee stock based compensation | 16,000 | 44,000 | 133,000 | 75,000 | |
| Cash cash equivalents and marketable securities | 92,200,000 | 92,200,000 | |||
| Working Capital | 92,200,000 | 92,200,000 | |||
| Accumulated deficit | (110,411,000) | (110,411,000) | (100,094,000) | ||
| Tax benefits of stock based compensation costs recognized | |||||