| In millions, except per share items | Sep-30-13 | Jun-30-13 | Mar-31-13 | Sep-30-12 | Jun-30-12 | Mar-31-12 | Dec-31-11 | Sep-30-11 |
| | 10-Q | 10-Q | 10-Q | 10-Q | 10-Q | 10-Q | 8-K | 10-Q |
| Cash flows from operating activities: | | | | | | | | |
| Net loss | | | | -18.6 | -19.9 | -23.9 | | |
| Adjustments to reconcile net loss to net cash used in operating activities: | | | | | | | | |
| Depreciation expense | | | | 0.1 | 0.1 | 0.1 | | |
| Stock-based compensation | | | | 1.5 | 1.1 | 1.2 | | |
| Noncash interest expense | | | | 0.2 | 0.2 | 0.3 | | |
| Changes in operating assets and liabilities: | | | | | | | | |
| Prepaid expenses and other current assets | | | | -0.2 | 0.3 | 1.0 | | |
| Accounts payable | | | | 0.1 | 1.1 | 1.1 | | |
| Accrued expenses | | | | 1.8 | 0.6 | -0.5 | | |
| Net cash used in operating activities | | | | -15.1 | -16.5 | -20.9 | | |
| |
| Cash flows from investing activities: | | | | | | | | |
| Purchases of property and equipment | | | | -0.3 | -0.4 | -0.3 | | |
| Net cash used in investing activities | | | | -0.3 | -0.7 | -3.6 | | |
| |
| Cash flows from financing activities: | | | | | | | | |
| Repayment of debt | | | | -6.4 | -4.9 | -3.2 | | |
| Proceeds from sale of common stock, net | | | | 0.0 | 0.4 | | | |
| Net cash (used in) provided by financing activities | | | | -6.4 | -4.6 | 7.1 | | |
| |
| Net increase (decrease) in cash and cash equivalents | | | | -21.8 | -21.8 | -17.4 | | |
| Cash and cash equivalents, beginning of period | | | | | | 62.0 | | |
| Cash and cash equivalents, end of period | | | | 1.3 | 1.2 | 44.6 | | |
| |
| Supplemental cash flow disclosures: | | | | | | | | |
| Noncash investing and financing activities: | | | | | | | | |
| Cash paid for interest | | | | 1.0 | 1.1 | 1.0 | | |