| Fiscal Year Ended December 31, | Six Months Ended | |||||||||||||||||||||||
| (dollars in thousands) | 2012 | 2013 | 2014 | 2015 | 2016 | June 30, 2017 | ||||||||||||||||||
| Ratio of earnings to fixed charges | ||||||||||||||||||||||||
| Earnings: | ||||||||||||||||||||||||
| Income (loss) before income taxes and cumulative effect of change in accounting principle | $ | (17,708 | ) | $ | (29,281 | ) | $ | (50,038 | ) | $ | (45,415 | ) | $ | (46,973 | ) | $ | (23,315 | ) | ||||||
| Add: | ||||||||||||||||||||||||
| Fixed charges | 1,099 | 2,338 | 4,008 | 5,059 | 6,916 | 3,827 | ||||||||||||||||||
| Amortization of capitalized interest | — | — | — | — | — | — | ||||||||||||||||||
| Distributed income of equity investees | — | — | — | — | — | — | ||||||||||||||||||
| Share of pre-tax losses of equity investees for which charges arising from guarantees are included in fixed charges | — | — | — | — | — | — | ||||||||||||||||||
| Less: | ||||||||||||||||||||||||
| Capitalized interest | — | — | — | — | — | — | ||||||||||||||||||
| Preference security dividend requirements of consolidated subsidiaries | 7,533 | 4,653 | — | — | — | — | ||||||||||||||||||
| Non-controlling interest in pre-tax income of subsidiaries that have not incurred fixed charges | — | — | — | — | — | — | ||||||||||||||||||
| Total earnings | $ | (24,142 | ) | $ | (31,596 | ) | $ | (46,030 | ) | $ | (40,356 | ) | $ | (40,057 | ) | $ | (19,488 | ) | ||||||
| Fixed charges: | ||||||||||||||||||||||||
| Total interest expense | $ | 804 | $ | 1,942 | $ | 3,540 | $ | 4,017 | $ | 5,672 | $ | 3,029 | ||||||||||||
| Capitalized interest | — | — | — | — | — | — | ||||||||||||||||||
Interest factor in rents (1) | 295 | 396 | 468 | 1,042 | 1,244 | 798 | ||||||||||||||||||
| Total fixed charges | $ | 1,099 | $ | 2,338 | $ | 4,008 | $ | 5,059 | $ | 6,916 | $ | 3,827 | ||||||||||||
Ratio of earnings to fixed charges (2) | — | — | — | — | — | — | ||||||||||||||||||
