| In millions, except per share items | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 | Dec-31-11 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Cash flows provided by (used in) operating activities: | | | | | | | | |
| Net loss | -138.7 | -46.3 | -24.2 | -36.6 | -23.9 | -21.5 | -0.7 | 0.0 |
| Adjustments to reconcile net loss to net cash used in operating activities: | | | | | | | | |
| Depreciation | 29.0 | 1.5 | 1.3 | 1.4 | 1.3 | 1.4 | 1.4 | 1.3 |
| Amortization of debt issuance costs | 4.6 | 2.1 | 0.1 | | 0.1 | 0.1 | 0.0 | |
| Non-cash interest expense | 1.2 | 3.8 | 0.2 | 1.2 | 7.7 | | | |
| Loss on disposal of property and equipment | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 | |
| Stock-based compensation | 7.7 | 2.8 | 2.7 | 0.6 | 0.6 | 0.4 | 0.6 | 1.2 |
| Warrants issued in legal settlement | | | | | | | | |
| Accounts receivable | -4.7 | -0.4 | 0.2 | -0.1 | 0.1 | -0.1 | 0.4 | -0.3 |
| Prepaid expenses and other current assets | -4.7 | 0.8 | 0.5 | -0.5 | -1.3 | -0.2 | -0.1 | 0.0 |
| Accounts payable | 7.2 | 0.4 | 1.0 | -1.0 | -0.4 | -0.3 | 0.7 | 0.2 |
| Accrued expenses and other current liabilities | 26.5 | 0.9 | 4.8 | 3.3 | 0.8 | -0.3 | -0.4 | 0.0 |
| Net cash used in operating activities | -66.7 | -34.3 | -13.2 | -31.4 | -15.5 | -4.3 | 3.0 | 3.3 |
| |
| Cash flows provided by (used in) investing activities: | | | | | | | | |
| Purchase of property and equipment | -1.0 | -2.0 | -2.0 | -0.8 | -1.5 | -1.0 | -0.5 | -0.7 |
| Capitalized Development Projects costs | -204.5 | -300.3 | -157.3 | -4.1 | -1.5 | -1.0 | -0.5 | -0.7 |
| Repayment of equipment loans | 35.0 | -20.0 | -15.0 | -15.5 | | | 0.2 | 0.0 |
| Net change in investments for Development Projects | 94.5 | -94.4 | | | | | | |
| Other | 0.0 | 0.0 | | | | | | |
| Net cash used in investing activities | -76.1 | -416.7 | -225.3 | -20.3 | -1.5 | -6.6 | -8.6 | -1.5 |
| |
| Cash flows provided by (used in) financing activities: | | | | | | | | |
| Proceeds from issuance of debt | | | | | | | | |
| Proceeds from related party long-term loan | | | | | | | | |
| Proceeds from related party equity contribution | | | | | | | | |
| Repayment of loans | | | | | | | | |
| Series B Preferred Stock dividend payment | -0.1 | -0.1 | -0.3 | | | | | |
| Proceeds from exercise of stock options and option matching rights | 0.1 | 0.0 | 0.1 | 2.7 | 2.8 | 1.0 | 0.0 | |
| Payment of debt issuance costs and Interest Rate Cap fees | -0.6 | -23.9 | -1.3 | | | | | |
| Other payments | -1.0 | -0.3 | -0.1 | | | | | |
| Net cash provided by financing activities | 139.5 | 465.6 | 253.7 | 51.7 | 16.0 | 9.4 | 0.0 | -0.2 |
| |
| Supplemental disclosures of cash flow information: | | | | | | | | |
| Cash paid for interest | 43.1 | 38.8 | 0.4 | 1.4 | 1.3 | 1.3 | 1.0 | 1.3 |
| Non-cash investing and financing activities: | | | | | | | | |
| Project Development Costs | | | | | | | | |