Exhibit 12.1
RATIO OF EARNINGS/ DEFICIENCY TO FIXED CHARGES
The following table sets forth, for each of the periods presented, our ratio of earnings to fixed charges and our coverage deficiency. You should read this table in conjunction with the financial statements and notes incorporated by reference in this prospectus.
| (in thousands) | Three Months Ended March 31, 2018 | Year Ended December 31, 2017 | Year Ended December 31, 2016 | Year Ended December 31, 2015 | ||||||||||||
| Net loss | $ | 38,218 | $ | 99,876 | $ | 71,290 | $ | 55,883 | ||||||||
| Ratio of earnings to fixed charges (1) | N/A | N/A | N/A | N/A | ||||||||||||
| Coverage deficiency | $ | (38,218 | ) | $ | (99,876 | ) | $ | (71,290 | ) | $ | (55,883 | ) | ||||
| (1) | We did not record earnings for the three months ended March 31, 2018, and for the years ended December 31, 2017, 2016 and 2015. Accordingly, our earnings were insufficient to cover fixed charges for such periods and we are unable to disclose a ratio of earnings to fixed charges for such periods. |