|                                                                                 |   | Six MonthsEnded June 30, |    |   | Years Ended December 31, |   |
|--------------------------------------------------------------------------------------|--------|--------------------------|---------|--------|--------------------------|--------|
|                                                                                 |   | 2013                     |    |   | 2012                     |   |   | 2011 |   |   | 2010 |   |   | 2009 |   |   | 2008 |   |
| Determination of earnings (loss):                                                    |   |                          |    |   |                          |   |   |  |   |   |  |   |   |  |   |   |  |   |
| Income (loss) from operations                                                        |   | $                        | (23,521 | )      |                     | $      | (35,431 | ) |   | $ | 10,381 |   |   | $ | (69,820 | ) |   | $ | (30,612 | ) |   | $ | (44,672 | ) |
| Add:                                                                                 |   |                     |    |   |                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Fixed charges                                                                        |   |                     | 522     |   |                     |   | 410 |   |   |   | 695 |   |   |   | 709 |   |   |   | 555 |   |   |   | 594 |   |
|                                                                                 |   |                     |    |   |                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Earnings (loss), as adjusted                                                         |   |  $                  | (22,999 | )      |                     | $      | (35,021 | ) |   | $ | 11,076 |   |   | $ | (69,111 | ) |   | $ | (30,057 | ) |   | $ | (44,078 | ) |
|                                                                                 |   |                     |    |   |                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Fixed charges:                                                                       |   |                     |    |   |                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                                                 |   |                     |    |   |                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Estimate of interest within rental expense                                           |   |                     | 522     |   |                     |   | 410 |   |   |   | 695 |   |   |   | 709 |   |   |   | 555 |   |   |   | 594 |   |
|                                                                                 |   |                     |    |   |                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Fixed charges                                                                        |   | $                        | 522     |   |                     | $      | 410 |   |   | $ | 695 |   |   | $ | 709 |   |   | $ | 555 |   |   | $ | 594 |   |
|                                                                                 |   |                     |    |   |                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| 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) |   | $                        | 23,521  |   |                     | $      | 35,431 |   |   | $ | - |   |   | $ | 69,820 |   |   | $ | 30,612 |   |   | $ | 44,672 |   |
|   |                                                                                                                                                                                                                                                    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|
| (1)    | For the years ended 2008 through 2010 and 2012 and for the six months ended June 30, 2013, 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. |   |