|                                                                                 |   |                          |   |   |   |    |   |   |    |   |   |    |   |   |    |   |   |
|--------------------------------------------------------------------------------------|--------|-------------------------------|--------|--------|--------|---------|--------|--------|---------|--------|--------|---------|--------|--------|---------|--------|--------|
|                                                                                 |   | Years Ended December 31, |   |
|                                                                                 |   | 2011                          |   | 2010   |   | 2009    |   | 2008   |    | 2007   |   |
| Determination of earnings (loss):                                                    |   |                          |   |   |   |    |   |   |    |   |   |
| Income (loss) from operations                                                        |   | $                             | 10,381 |   | $      | (69,820 | )      | $      | (30,612 | )      | $      | (44,672 | )      | $      | (43,688 | )      |
| Add:                                                                                 |   |                          |   |   |   |    |   |   |    |   |   |
| Fixed charges                                                                        |   | 695                           |   | 709    |   | 555     |   | 594    |    | 483    |   |
|                                                                                 |   |                          |   |   |   |    |   |   |    |   |   |
| Earnings (loss), as adjusted                                                         |   | $                             | 11,076 |   | $      | (69,111 | )      | $      | (30,057 | )      | $      | (44,078 | )      | $      | (43,205 | )      |
|                                                                                 |   |                          |   |   |   |    |   |   |    |   |   |
| Fixed charges:                                                                       |   |                          |   |   |   |    |   |   |    |   |   |
|                                                                                 |   |                          |   |   |   |    |   |   |    |   |   |
| Estimate of interest within rental expense                                           |   | 695                           |   | 709    |   | 555     |   | 594    |    | 483    |   |
|                                                                                 |   |                          |   |   |   |    |   |   |    |   |   |
| Fixed charges                                                                        |   | $                             | 695    |   | $      | 709     |   | $      | 555     |   | $      | 594     |   | $      | 483     |   |
|                                                                                 |   |                          |   |   |   |    |   |   |    |   |   |
| Preferred stock dividends                                                            |   | $                             | -      |   | $      | -       |   | $      | -       |   | $      | -       |   | $      | -       |   |
|                                                                                 |   |                          |   |   |   |    |   |   |    |   |   |
|                                                                                 |   |                          |   |   |   |    |   |   |    |   |   |    |   |   |    |   |
| Ratio of earnings (loss) to fixed charges and preferred stock dividends              |   | 16                            |   | *      |   | *       |   | *      |    | *      |   |
| Coverage deficiency amount for total fixed charges and preferred stock dividends (1) |   |                          | -      |   | $      | 69,820  |   | $      | 30,612  |   | $      | 44,672  |   | $      | 43,688  |   |

|   | ______________(1)       For the years ended 2007 through 2010, the Company’s coverage ratio is less than one-to-one and it must generate additional earnings of these specified amounts to achieve a coverage ratio of 1:1. |
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