| In millions, except per share items | Sep-30-19 | Jun-30-19 | Mar-31-19 | Dec-31-18 | Sep-30-18 | Jun-30-18 | Mar-31-18 | Dec-31-17 |
| | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Services | 323.4 | 274.8 | 229.2 | 212.3 | 201.8 | 199.1 | 181.3 | 176.9 |
| Product | 29.8 | 30.4 | 32.2 | 32.0 | 32.1 | 34.1 | 33.2 | 30.7 |
| Total revenue | 405.3 | 357.4 | 313.6 | 296.4 | 281.1 | 265.1 | 246.4 | 239.5 |
| Total revenue growth | 44.2% | 34.8% | 27.3% | 23.8% | 21.6% | 19.6% | 14.1% | 15.7% |
| Services | 71.4 | 58.2 | 52.6 | | 50.8 | 33.7 | 30.6 | |
| Product | 1.4 | 1.2 | 1.2 | | 1.3 | 0.9 | 1.5 | |
| Amortization of intangible assets | 54.1 | 43.2 | 32.3 | 28.1 | 22.4 | 16.9 | 11.6 | 10.3 |
| Total cost of revenue | 116.4 | 98.3 | 87.9 | 85.4 | 80.0 | 75.8 | 71.0 | 70.1 |
| Gross profit | 288.9 | 259.1 | 225.7 | 211.0 | 201.1 | 189.3 | 175.4 | 169.4 |
| Gross margin | 71.3% | 72.5% | 72.0% | 71.2% | 71.5% | 71.4% | 71.2% | 70.7% |
| |
| Operating expenses: | | | | | | | | |
| Research and development | 86.8 | 72.9 | 60.8 | 57.5 | 55.3 | 53.1 | 48.4 | 46.2 |
| General and administrative | 66.3 | 61.2 | 57.1 | 50.5 | 48.5 | 47.1 | 44.6 | 42.9 |
| Sales and marketing | 118.6 | 102.4 | 87.5 | 85.6 | 84.3 | 85.2 | 86.1 | 89.3 |
| Amortization of intangible assets | 54.1 | 43.2 | 32.3 | 28.1 | 22.4 | 16.9 | 11.6 | 10.3 |
| Restructuring charges | | 1.1 | | 1.3 | 1.3 | 0.9 | 0.9 | |
| Total operating expenses | 627.0 | 540.2 | 459.7 | 429.6 | 411.3 | 396.4 | 375.0 | 370.2 |
| (Loss) income from operations | -11.6 | -0.4 | 4.2 | 3.7 | 1.7 | -3.7 | -8.1 | -12.1 |
| Operating margin | -2.9% | -0.1% | 1.3% | 1.2% | 0.6% | -1.4% | -3.3% | -5.0% |
| Interest expense | -29.3 | -21.4 | -13.0 | -11.6 | -11.3 | -10.9 | -9.8 | -7.4 |
| Interest income | 2.7 | 2.8 | 2.6 | 1.9 | 1.0 | 0.8 | 0.8 | 0.6 |
| Other income (expense), net | 1.2 | 0.4 | 0.4 | 0.2 | 0.2 | 0.3 | 1.0 | 1.3 |
| (Loss) income before income taxes | -37.1 | -18.5 | -5.8 | -5.8 | -8.5 | -13.5 | -16.2 | -17.7 |
| (Benefit) provision for income taxes | -14.6 | -10.5 | -3.4 | -13.3 | -13.7 | -14.6 | -16.5 | -13.7 |
| Tax rate | 39.3% | 56.9% | 58.8% | 230.7% | 161.7% | | 102.1% | |
| Net (loss) income | -22.5 | -8.0 | -2.4 | 7.6 | 5.2 | 1.0 | 0.3 | -4.0 |
| |
| Earnings Per Share, Basic | ($0.66) | ($0.24) | ($0.11) | $0.25 | $0.19 | $0.04 | $0.01 | ($0.14) |
| Earnings Per Share, Diluted | ($0.66) | ($0.24) | ($0.11) | $0.23 | $0.17 | $0.02 | ($0.01) | ($0.14) |
| |
| Weighted Average Number of Shares Outstanding, Basic | 33.6 | 33.1 | 31.7 | 30.2 | 29.4 | 28.1 | 27.9 | 27.7 |
| Weighted Average Number of Shares Outstanding, Diluted | 34.5 | 35.0 | 33.5 | 32.2 | 30.7 | 28.6 | 28.3 | 27.9 |