| In millions, except per share items | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 | Dec-31-11 | Dec-31-10 | Dec-31-09 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Cash Flows from Operating Activities | | | | | | | | |
| Net loss | -17.3 | -29.2 | -32.5 | -28.5 | -18.9 | -12.5 | -4.8 | -27.2 |
| |
| Adjustments to reconcile net loss to net cash used in operating activities: | | | | | | | | |
| Depreciation | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 | 0.1 |
| Noncash stock-based compensation | 1.9 | 3.7 | 3.8 | 3.2 | 2.8 | 2.3 | 0.6 | 1.3 |
| Increase in prepaid expenses and other current assets | 0.0 | 0.1 | 0.0 | 0.2 | -0.3 | 0.2 | -0.2 | 1.2 |
| Increase (decrease) in accounts payable and accrued expenses | -0.3 | 0.0 | -0.6 | -0.2 | 2.4 | 0.1 | -0.6 | 1.9 |
| Net cash used in operating activities | -15.6 | -25.3 | -29.3 | -25.3 | -14.1 | -9.8 | -5.0 | -22.1 |
| |
| Cash Flows from Investing Activities | | | | | | | | |
| Capital expenditures | | | | -0.1 | 0.0 | 0.0 | 0.0 | |
| Net cash used in investing activities | | | | -0.1 | 0.0 | -0.3 | -0.4 | -0.5 |
| |
| Cash Flows from Financing Activities | | | | | | | | |
| Net cash provided by financing activities | 2.9 | 0.1 | 0.1 | 77.0 | 33.8 | 11.7 | 6.4 | 5.0 |
| Net decrease in cash, cash equivalents and restricted cash | -12.7 | -25.2 | -29.2 | 51.6 | 19.6 | 1.6 | 1.1 | -17.6 |
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| Noncash transactions: | | | | | | | | |