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Organization and Summary of Significant Accounting Policies (Details) (USD $)
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3 Months Ended | 9 Months Ended | |||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Dec. 31, 2011
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| Organization and Summary of Significant Accounting Policies (Textual) [Abstract] | |||||
| Cash cash equivalents and marketable securities | $ 98,700,000 | $ 98,700,000 | |||
| Working Capital | 97,900,000 | 97,900,000 | |||
| Accumulated deficit | (105,556,000) | (105,556,000) | (100,094,000) | ||
| Employee stock based compensation costs | 707,000 | 465,000 | 2,005,000 | 1,594,000 | |
| Shares of common stock issued | 26,233 | 171,212 | |||
| Stock option modification expense | 197,000 | 28,000 | 154,000 | ||
| Non-employee stock based compensation | 33,000 | 16,000 | 166,000 | 92,000 | |
| Tax benefits of stock based compensation costs recognized | |||||