| In millions, except per share items | Mar-31-16 | Dec-31-15 | Sep-30-15 | Jun-30-15 | Mar-31-15 | Dec-31-14 | Sep-30-14 | Jun-30-14 |
| | 10-Q | 8-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| Interest Paid | 0.0 | | 0.0 | 0.0 | 0.0 | | 0.1 | 0.1 |
| |
| Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | | | | | | | | |
| Cash flows from operating activities | | | | | | | | |
| Net loss | -1.5 | | -8.4 | -5.9 | -3.1 | -24.9 | -41.9 | -12.1 |
| |
| Adjustments to reconcile net loss to net cash provided by operating activities: | | | | | | | | |
| Depreciation and amortization | 2.6 | | 6.3 | 4.0 | 1.9 | | 5.8 | 2.0 |
| Deferred Income Tax Expense (Benefit) | 0.1 | | 0.2 | 0.2 | 0.1 | | 0.2 | 0.1 |
| Share‑based compensation | 3.1 | | 7.8 | 4.6 | 2.0 | | 6.4 | 1.8 |
| Changes in operating assets and liabilities: | | | | | | | | |
| Accounts receivable, net | 0.6 | | -1.7 | -1.2 | 0.7 | -2.7 | -1.6 | 0.1 |
| Prepaid expenses and other assets | 0.0 | | 0.1 | -0.2 | 0.0 | | 0.2 | -0.3 |
| Deferred revenue, including long-term portion | 2.4 | | 9.5 | 5.9 | 2.3 | | 7.8 | 3.3 |
| Accounts payable | -0.7 | | 0.4 | 0.0 | -0.1 | | 0.4 | 0.7 |
| Accrued expenses and other | -1.5 | | 0.0 | 0.5 | -0.6 | | 1.8 | 0.7 |
| Net cash provided by operating activities | 5.0 | | 14.2 | 7.8 | 3.2 | | 0.1 | 2.3 |
| |
| Cash flows from investing activities | | | | | | | | |
| Increase (Decrease) in Restricted Cash | | | -0.6 | -1.2 | -0.4 | -1.3 | -1.3 | |
| Purchases of property and equipment, including software development costs | -1.6 | | -11.1 | -7.9 | -2.9 | -8.1 | -5.8 | -2.1 |
| Net cash used in investing activities | -1.6 | | -11.7 | -9.1 | -3.3 | -9.4 | -7.0 | -2.1 |
| |
| Cash flows from financing activities | | | | | | | | |
| Payments on capital leases | | | -0.4 | -0.4 | -0.2 | -0.8 | -0.6 | -0.2 |
| Proceeds from exercise of options | 0.1 | | | | 1.1 | | | |
| Proceeds from Issuance of Common Stock | 0.0 | | 4.5 | 3.1 | 0.1 | | 2.2 | 1.0 |
| Net cash provided by financing activities | 0.2 | | 4.0 | 2.6 | 1.0 | -2.6 | -4.1 | -5.0 |
| Effect of changes in foreign exchange rates on cash and cash equivalents | 0.0 | | -0.1 | 0.0 | -0.1 | -0.2 | -0.1 | 0.0 |
| Net increase in cash and cash equivalents | 3.6 | | 6.4 | 1.2 | 0.7 | -10.4 | -11.1 | -4.8 |
| Cash and cash equivalents, beginning of period | 78.7 | | 66.8 | 66.8 | 66.8 | | 77.1 | |
| Cash and cash equivalents, end of period | 82.3 | | 73.2 | 68.0 | 67.5 | | 66.0 | -4.8 |
| |
| Supplemental Cash Flow Information [Abstract] | | | | | | | | |