| 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 |
| Services | 263.1 | 207.4 | 186.1 | | 122.6 | 107.2 | 84.0 | 60.5 |
| Product | 33.3 | 32.1 | 20.9 | | | | | |
| Total revenue | 296.4 | 239.5 | 207.0 | 136.6 | 122.6 | 107.2 | 84.0 | 60.5 |
| Total revenue growth | 23.8% | 15.7% | 51.5% | 11.4% | 14.4% | 27.5% | 38.9% | 56.9% |
| Services | 68.0 | 59.2 | 55.5 | | 38.6 | 34.9 | 29.1 | 23.2 |
| Product | 1.7 | 2.7 | 2.8 | | | | | |
| Amortization of intangible assets | 28.1 | 10.3 | 3.9 | | | | | |
| Total cost of revenue | 85.4 | 70.1 | 60.9 | 38.8 | 38.6 | 34.9 | 29.1 | 23.2 |
| Gross profit | 211.0 | 169.4 | 146.0 | 97.8 | 84.1 | 72.3 | 55.0 | 37.3 |
| Gross margin | 71.2% | 70.7% | 70.6% | 71.6% | 68.5% | 67.5% | 65.4% | 61.7% |
| |
| Operating expenses: | | | | | | | | |
| Research and development | 57.5 | 46.2 | 33.3 | 28.1 | 24.1 | 20.9 | 19.9 | 16.5 |
| General and administrative | 50.5 | 42.9 | 41.1 | 37.3 | 17.9 | 14.3 | 9.9 | 6.6 |
| Sales and marketing | 85.6 | 89.3 | 72.4 | 53.7 | 49.9 | 47.3 | 42.7 | 37.7 |
| Amortization of intangible assets | 28.1 | 10.3 | 3.9 | | | | | |
| Restructuring charges | 1.3 | 1.0 | 0.9 | 0.5 | 0.8 | 0.3 | 1.3 | |
| Total operating expenses | 430.3 | 371.1 | 300.3 | 119.5 | 185.8 | 82.9 | 73.9 | 60.9 |
| (Loss) income from operations | 3.7 | -12.1 | -2.8 | -21.7 | -8.6 | -10.6 | -18.9 | -23.6 |
| Operating margin | 1.2% | -5.0% | -1.3% | -15.9% | -7.0% | -9.8% | -22.5% | -38.9% |
| Interest expense | -11.6 | -7.4 | -0.1 | | | | | |
| Interest income | 1.9 | 0.6 | 0.0 | 0.0 | | | | |
| Other income (expense), net | 0.2 | 1.3 | 0.2 | 0.1 | -0.4 | 0.0 | 0.0 | 0.0 |
| (Loss) income before income taxes | -5.8 | -17.7 | -2.7 | -21.5 | -9.0 | -10.6 | -18.9 | -23.5 |
| (Benefit) provision for income taxes | -13.3 | -13.7 | 1.4 | 0.1 | 0.4 | 0.1 | 0.0 | 0.0 |
| Tax rate | 230.7% | 77.4% | | | | | | |
| Net (loss) income | 7.6 | -4.0 | -4.1 | -21.6 | -9.4 | -10.6 | -18.9 | -23.5 |
| |
| Earnings Per Share, Basic | $0.24 | ($0.14) | ($0.15) | ($0.80) | ($0.35) | ($0.41) | ($0.74) | ($1.84) |
| Earnings Per Share, Diluted | $0.22 | ($0.14) | ($0.15) | ($0.80) | ($0.35) | ($0.41) | ($0.74) | ($1.84) |
| |
| Weighted Average Number of Shares Outstanding, Basic | 31.0 | 27.8 | 27.0 | 27.2 | 26.8 | 26.2 | 25.5 | 12.8 |
| Weighted Average Number of Shares Outstanding, Diluted | 33.7 | 27.8 | 27.0 | 27.2 | 26.8 | 26.2 | 25.5 | 12.8 |