| Years Ended December 31, | ||||||||||||||||||||
| 2004 | 2005 | 2006 | 2007 | 2008 | ||||||||||||||||
| Net loss from continuing operations | $ | (8,807 | ) | $ | (19,972 | ) | $ | (46,345 | ) | $ | (41,167 | ) | $ | (39,355 | ) | |||||
| Fixed charges: | ||||||||||||||||||||
| Interest expense | 550 | 82 | 273 | 348 | 218 | |||||||||||||||
| Estimate of interest within rental expense | 51 | 324 | 524 | 611 | 658 | |||||||||||||||
| Total fixed charges | 601 | 406 | 797 | 959 | 876 | |||||||||||||||
Deficiency of earnings available to cover fixed charges(2) | $ | (8,206 | ) | $ | (19,566 | ) | $ | (45,548 | ) | $ | (40,208 | ) | $ | (38,479 | ) | |||||
| Ratio of earnings to fixed charges | — | — | — | — | — | |||||||||||||||
| (1) | The ratio of earnings to fixed charges is defined as earnings divided by fixed charges. For purposes of this ratio, earnings is defined as net loss from continuing operations plus fixed charges. Fixed charges are defined as the sum of interest expense and the estimate of interest within rental expense. | |
| (2) | For the years ended December 31, 2004, 2005, 2006, 2007 and 2008, earnings were insufficient to cover fixed charges by $8.8 million, $20.0 million, $46.3 million, $41.2 million and $39.4 million, respectively. |
