| 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 |
| Revenues: | | | | | | | | |
| Product revenue | 37.1 | 31.9 | 34.4 | 34.2 | 56.1 | 52.3 | 43.9 | 34.1 |
| Services revenue | 33.3 | 35.3 | 34.3 | 38.5 | 64.2 | 52.3 | 48.0 | 40.8 |
| Maintenance revenue | 40.1 | 39.8 | 39.9 | 37.8 | | | | |
| Total revenues | 110.5 | 107.0 | 108.7 | 110.5 | 129.5 | 104.6 | 91.9 | 74.9 |
| Total revenues growth | 3.3% | -1.5% | -1.7% | -14.6% | 23.8% | 13.8% | 22.7% | -18.1% |
| Cost of revenues (excluding depreciation and amortization, shown below): | | | | | | | | |
| Cost of product revenue | 9.3 | 8.9 | 8.4 | 7.5 | 8.0 | 6.0 | 4.9 | 2.8 |
| Cost of services revenue | 21.4 | 24.3 | 25.4 | 28.1 | 24.7 | 22.5 | 19.9 | 17.9 |
| Cost of maintenance revenue | 2.5 | 2.4 | 2.2 | | | | | |
| Total cost of revenues (excluding depreciation and amortization, shown below) | 33.2 | 35.6 | 36.0 | 37.5 | 36.4 | 28.4 | 24.8 | 20.7 |
| |
| Operating expenses: | | | | | | | | |
| Selling and marketing | 43.3 | 38.7 | 39.0 | 41.5 | 42.3 | 37.0 | 35.9 | 36.5 |
| Research and development | 24.5 | 21.2 | 23.0 | 27.7 | 24.5 | 18.9 | 17.0 | 14.2 |
| General and administrative | 24.9 | 19.1 | 18.4 | 17.4 | 21.2 | 16.4 | 14.0 | 13.5 |
| Depreciation and amortization | 5.1 | 6.4 | 7.4 | 7.7 | 6.9 | 5.4 | 4.7 | 4.4 |
| Total operating expenses | 97.9 | 85.4 | 87.8 | 94.3 | 94.8 | 77.7 | 71.6 | 68.6 |
| Operating loss | -20.6 | -14.1 | -15.1 | -21.3 | -1.8 | -1.6 | -4.6 | -14.4 |
| Operating margin | -18.6% | -13.1% | -13.9% | -19.3% | -1.4% | -1.5% | -5.0% | -19.3% |
| |
| Other income and expense: | | | | | | | | |
| Interest income | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 | 0.1 |
| Interest expense | -0.1 | 0.0 | 0.0 | 0.0 | -0.1 | 0.0 | 0.0 | 0.0 |
| Other income, net | 0.0 | 0.0 | 0.7 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Total other income and expense | 0.0 | 0.0 | 0.7 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 |
| Loss before income taxes | -20.6 | -14.0 | -14.5 | | | | | |
| Income tax provision | 0.1 | 0.4 | 0.3 | 0.2 | 0.2 | 0.2 | 0.1 | -0.4 |
| Net loss | -20.7 | -14.4 | -14.7 | -21.5 | -2.0 | -1.6 | | |
| |
| Net loss per share: | | | | | | | | |
| Basic (in dollars per share) | ($0.72) | ($0.51) | ($0.55) | ($0.83) | ($0.08) | ($0.07) | ($0.20) | ($0.60) |
| Diluted (in dollars per share) | ($0.72) | ($0.51) | ($0.55) | ($0.83) | ($0.08) | ($0.07) | ($0.20) | ($0.60) |
| |
| Weighted average number of shares used in per share calculation: | | | | | | | | |
| Basic (in shares) | 28.8 | 28.0 | 26.8 | 25.8 | 24.6 | 23.3 | 23.0 | 23.1 |
| Diluted (in shares) | 28.8 | 28.0 | 26.8 | 25.8 | 24.6 | 23.3 | 23.0 | 23.1 |