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Stock Plans (Tables)
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12 Months Ended |
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Dec. 31, 2013
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| Stock Plans [Abstract] |
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| Schedule Of Share Based Compensation Activity [Table Text Block] |
Activity under our stock plans, as well as non-plan activity, is summarized below (shares in thousands):
| | | | | Number of | | | | |
| | | Shares or | | Options and | | | | |
| | | Awards Available | | Awards | | Weighted Average | |
| | | For Grant | | Outstanding | | Exercise Price | |
| Balance at December 31, 2010 | | 3,393 | | 5,115 | | $ | 2.29 | |
| Options granted | | (734) | | 734 | | $ | 1.44 | |
| Options cancelled and expired | | 45 | | (241) | | $ | 15.01 | |
| Options forfeited | | 55 | | (55) | | $ | 1.77 | |
| Awards granted | | (181) | | 181 | | $ | 0.00 | |
| Awards issued | | — | | (139) | | $ | 0.00 | |
| Balance at December 31, 2011 | | 2,578 | | 5,595 | | $ | 1.56 | |
| Options granted | | (1,718) | | 1,718 | | $ | 1.14 | |
| Options cancelled and expired | | 290 | | (290) | | $ | 5.54 | |
| Awards issued | | — | | (181) | | $ | 0.00 | |
| Expiration of option plan | | (1,150) | | — | | $ | 0.00 | |
| Balance at December 31, 2012 | | — | | 6,842 | | $ | 1.33 | |
| Options exercised | | — | | (75) | | $ | 1.50 | |
| Options cancelled and expired | | — | | (35) | | $ | 3.29 | |
| Balance at December 31, 2013 | | — | | 6,732 | | $ | 1.31 | |
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| Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
The options outstanding at December 31, 2013 have been segregated into four ranges for additional disclosure as follows (options in thousands):
| | | Options Outstanding | | Options Exercisable | |
| | | | | Weighted | | | | | | | | | |
| | | | | Average | | Weighted | | | | Weighted | |
| | | Number | | Remaining | | Average | | Number | | Average | |
| Range of Exercise Prices | | Outstanding | | Life (Years) | | Exercise Price | | Exercisable | | Exercise Price | |
| $0.69 - $1.53 | | 5,423 | | 6.32 | | $ | 1.05 | | 5,422 | | $ | 1.05 | |
| $1.54 - $2.38 | | 604 | | 3.85 | | $ | 2.19 | | 601 | | $ | 2.19 | |
| $2.39 - $3.22 | | 643 | | 3.27 | | $ | 2.52 | | 643 | | $ | 2.52 | |
| $3.23 - $4.06 | | 62 | | 0.11 | | $ | 3.70 | | 62 | | $ | 3.70 | |
| $0.69 - $4.06 | | 6,732 | | 5.75 | | $ | 1.31 | | 6,728 | | $ | 1.31 | |
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| Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] |
We use the Black-Scholes-Merton option-pricing model with the following assumptions to estimate the stock-based compensation expense for the years ended December 31, 2013, 2012 and 2011:
| | | Years Ended December 31, | |
| | | 2013 | | | 2012 | | | 2011 | |
| Weighted-average risk-free interest rate | | 0.92 | % | | 0.91 | % | | 2.3 | % |
| Expected dividend payments | | — | | | — | | | — | |
| Expected holding period (years)(1) | | 3.9 | | | 5.1 | | | 5.4 | |
| Weighted-average volatility factor(2) | | 1.38 | | | 1.75 | | | 1.71 | |
| Estimated forfeiture rates for options granted to management(3) | | 23 | % | | 23 | % | | 23 | % |
| Estimated forfeiture rates for options granted to non-management(3) | | 41 | % | | 41 | % | | 41 | % |
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| (1) | Expected holding period is based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and the expectations of future employee behavior. |
| (2) | Weighted average volatility is based on the historical volatility of our common stock. |
| (3) | Estimated forfeiture rates are based on historical data. |
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| Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
The following table summarizes the stock-based compensation expense and impact on our basic and diluted loss per share for the years ended December 31, 2013, 2012 and 2011:
| | | Years Ended December 31, | |
| (in thousands, except per share amounts) | | 2013 | | 2012 | | 2011 | |
| Research and development | | $ | 378 | | $ | 1,560 | | $ | 371 | |
| General and administrative | | | 300 | | | 1,021 | | | 806 | |
| Total stock-based compensation expenses | | $ | 678 | | $ | 2,581 | | $ | 1,177 | |
| Increase in basic net income (loss) per share | | $ | (0.01) | | $ | (0.04) | | $ | (0.02) | |
| Increase in diluted net income (loss) per share | | $ | (0.01) | | $ | (0.04) | | $ | (0.02) | |
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| Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
The following table summarizes option activity for the year ended December 31, 2013:
| | | | | | | | Weighted | | | | |
| | | | | Weighted | | Average | | | | |
| | | | | Average | | Remaining | | Aggregate | |
| | | | | Exercise | | Contractual | | Intrinsic | |
| (in thousands, except per share amounts) | | Shares | | Price | | Term | | Value | |
| Outstanding at January 1, 2012 | | 6,842 | | $ | 133 | | | | | | |
| Exercised | | (75) | | | 1.50 | | | | | | |
| Cancelled | | (35) | | | 3.29 | | | | | | |
| Outstanding at December 31, 2013 | | 6,732 | | $ | 1.31 | | 5.75 | | $ | — | |
| Exercisable at December 31, 2013 | | 6,728 | | $ | 1.31 | | 5.75 | | $ | — | |
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