| 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 | 118.8 | 114.4 | 71.5 | 18.6 | 70.3 | 68.8 | 54.6 | 8.1 |
| Product | 6.8 | 7.1 | 9.7 | 6.2 | 7.4 | 8.9 | 9.5 | 6.3 |
| Total revenue | 125.6 | 121.5 | 81.2 | 77.0 | 77.7 | 77.7 | 64.0 | 61.7 |
| Total revenue growth | 61.7% | 56.3% | 26.8% | 24.8% | 26.0% | 31.7% | 12.1% | 15.3% |
| Services | 30.4 | 24.0 | 17.1 | | 17.1 | 18.4 | 15.3 | |
| Product | 0.5 | 0.4 | 0.4 | | 0.4 | 0.4 | 0.6 | |
| Amortization of intangible assets | 19.2 | 18.8 | 7.6 | 8.5 | 8.2 | 8.0 | 3.4 | 2.8 |
| Total cost of revenue | 40.0 | 33.5 | 20.8 | 22.2 | 21.8 | 23.1 | 18.3 | 16.8 |
| Gross profit | 85.6 | 88.0 | 60.4 | 54.8 | 55.9 | 54.7 | 45.7 | 44.9 |
| Gross margin | 68.2% | 72.4% | 74.4% | 71.2% | 71.9% | 70.3% | 71.4% | 72.8% |
| |
| Operating expenses: | | | | | | | | |
| Research and development | 28.8 | 27.9 | 15.8 | 14.3 | 14.9 | 15.7 | 12.5 | 12.1 |
| General and administrative | 16.2 | 17.6 | 21.0 | 11.5 | 11.2 | 13.5 | 14.5 | 9.5 |
| Sales and marketing | 37.4 | 36.9 | 21.8 | 22.5 | 21.2 | 22.1 | 19.9 | 21.1 |
| Amortization of intangible assets | 19.2 | 18.8 | 7.6 | 8.5 | 8.2 | 8.0 | 3.4 | 2.8 |
| Restructuring charges | | 0.7 | | 0.0 | 0.4 | 0.0 | 0.9 | |
| Total operating expenses | 194.1 | 194.8 | 129.7 | 108.3 | 107.4 | 114.2 | 99.7 | 90.0 |
| (Loss) income from operations | -6.9 | -4.8 | -2.4 | 2.6 | 4.3 | -0.3 | -2.9 | 0.6 |
| Operating margin | -5.5% | -4.0% | -3.0% | 3.3% | 5.6% | -0.4% | -4.6% | 0.9% |
| Interest expense | -10.8 | -11.8 | -4.0 | -2.7 | -2.9 | -3.4 | -2.6 | -2.4 |
| Interest income | 0.2 | 0.4 | 1.0 | 1.1 | 0.4 | 0.2 | 0.2 | 0.2 |
| Other income (expense), net | 0.6 | 0.2 | 0.2 | 0.2 | -0.1 | 0.2 | 0.0 | 0.1 |
| (Loss) income before income taxes | -16.9 | -16.1 | -5.3 | 1.1 | 1.7 | -3.3 | -5.3 | -1.5 |
| (Benefit) provision for income taxes | -2.9 | -4.8 | -7.3 | 0.4 | 1.1 | 2.3 | -17.2 | 0.1 |
| Tax rate | 17.4% | 29.9% | 138.1% | 37.4% | 65.2% | | 326.6% | |
| Net (loss) income | -14.0 | -11.3 | 2.0 | 0.7 | 0.6 | -5.7 | 11.9 | -1.6 |
| |
| Earnings Per Share, Basic | ($0.40) | ($0.33) | $0.06 | $0.01 | $0.02 | ($0.20) | $0.42 | ($0.05) |
| Earnings Per Share, Diluted | ($0.40) | ($0.33) | $0.06 | $0.01 | $0.02 | ($0.20) | $0.40 | ($0.05) |
| |
| Weighted Average Number of Shares Outstanding, Basic | 34.6 | 34.5 | 34.2 | 31.0 | 32.9 | 28.6 | 28.3 | 27.8 |
| Weighted Average Number of Shares Outstanding, Diluted | 34.6 | 34.5 | 35.3 | 33.7 | 36.5 | 28.6 | 30.0 | 27.8 |