|                                                                                 |   | Three MonthsEnded March 31, |    |   | Years Ended December 31, |   |
|--------------------------------------------------------------------------------------|--------|----------------------------------|---------|--------|--------------------------|--------|
|                                                                                 |   | 2015                             |    |   | 2014                     |   |   | 2013 |   |   | 2012 |   |   | 2011 |   |   | 2010 |   |
| Determination of earnings (loss):                                                    |   |                                  |    |   |                          |   |   |  |   |   |  |   |   |  |   |   |  |   |
| Income (loss) from operations                                                        |   | $                                | (10,254 | )      |                     | $      | 4,410 |   |   | $ | (42,934 | ) |   | $ | (35,431 | )  |   | $ | 10,381 |   |   | $ | (69,820 | ) |
| Add:                                                                                 |   |                             |    |   |                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Fixed charges                                                                        |   |                             | 90      |   |                     |   | 373 |   |   |   | 710 |   |   |   | 410 |   |   |   | 695 |   |   |   | 709 |   |
|                                                                                 |   |                             |    |   |                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Earnings (loss), as adjusted                                                         |   |  $                          | (10,164 | )      |                     | $      | 4,783 |   |   | $ | (42,224 | ) |   | $ | (35,021 | )  |   | $ | 11,076 |   |   | $ | (69,111 | ) |
|                                                                                 |   |                             |    |   |                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Fixed charges:                                                                       |   |                             |    |   |                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                                                 |   |                             |    |   |                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Estimate of interest within rental expense                                           |   |                             | 90      |   |                     |   | 373 |   |   |   | 710 |   |   |   | 410 |   |   |   | 695 |   |   |   | 709 |   |
|                                                                                 |   |                             |    |   |                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Fixed charges                                                                        |   | $                                | 90      |   |                     | $      | 373 |   |   | $ | 710 |   |   | $ | 410 |   |   | $ | 695 |   |   | $ | 709 |   |
|                                                                                 |   |                             |    |   |                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Preferred stock dividends                                                            |   | $                                | -       |   |                     | $      | - |   |   | $ | - |   |   | $ | - |   |   | $ | - |   |   | $ | - |   |
|                                                                                 |   |                             |    |   |                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                                                 |   |                             |    |   |                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Ratio of earnings (loss) to fixed charges and preferred stock dividends              |   |                             | *       |   |                     |   | 13 |   |   |   | * |   |   |   | * |   |   |   | 16 |   |   |   | * |   |
| Coverage deficiency amount for total fixed charges and preferred stock dividends (1) |   | $                                | 10,254  |   |                     | $      | - |   |   | $ | 42,934 |   |   | $ | 35,431 |   |   | $ | - |   |   | $ | 69,820 |   |
|   |                                                                                                                                                                                                                                             |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|--------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|
| (1)    | For the years ended 2010, 2012, 2013 and for the three months ended March 31, 2015, 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. |   |