| 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/A | 10-K | 10-K |
| Revenue | 270.8 | 246.0 | 204.9 | 158.8 | 140.3 | 127.3 | 117.9 | 114.8 |
| Revenue growth | 10.1% | 20.0% | 29.0% | 13.2% | 10.2% | 7.9% | 2.7% | 10.4% |
| Cost of products sold | 68.3 | 62.9 | 51.4 | 41.4 | 37.9 | 35.7 | 34.0 | 33.1 |
| Gross profit | 202.5 | 182.8 | 151.5 | 117.5 | 102.4 | 91.6 | 83.9 | 81.7 |
| Gross margin | 74.8% | 74.3% | 73.9% | 74.0% | 73.0% | 71.9% | 71.1% | 71.1% |
| |
| Operating expenses: | | | | | | | | |
| Selling, general and administrative | 164.3 | 143.4 | 128.1 | 91.8 | 82.3 | 70.5 | 66.7 | 68.5 |
| Research, development and other technology | 67.5 | 64.4 | 28.7 | 22.1 | 16.8 | 17.7 | 14.9 | 15.1 |
| Acquisition transaction, integration and legal costs | 1.9 | 29.5 | 17.3 | | 0.3 | | | |
| Intangible asset amortization | 12.2 | 13.3 | 6.3 | 0.9 | | | | |
| Contingent consideration expense | 0.2 | 2.7 | 2.1 | 0.9 | | | | |
| Total operating expenses | 246.1 | 233.4 | 188.4 | 117.1 | 99.4 | 90.3 | 90.9 | 93.7 |
| Operating loss | -43.6 | -50.5 | -37.0 | 0.4 | 2.9 | 1.3 | -7.0 | -12.0 |
| Operating margin | -16.1% | -20.5% | -18.0% | 0.2% | 2.1% | 1.0% | -6.0% | -10.4% |
| |
| Other expense: | | | | | | | | |
| Interest expense | -13.3 | -7.9 | -4.1 | 0.0 | 0.0 | 0.1 | 0.2 | 0.4 |
| Foreign currency transaction gain (loss) | -0.4 | -0.4 | -0.2 | 0.0 | 0.0 | -0.1 | 0.0 | |
| Total other expense | -13.7 | -8.2 | -4.3 | 0.0 | 0.0 | -0.2 | 0.2 | -1.3 |
| Loss before income tax expense | -57.3 | -58.7 | -41.2 | 0.4 | 3.0 | 1.1 | -6.8 | -13.2 |
| Income tax expense | 0.8 | 0.7 | -0.3 | 0.8 | 0.7 | 0.2 | 6.2 | 0.1 |
| Tax rate | | | 0.8% | 190.2% | 24.8% | 20.5% | | |
| Net loss | -58.1 | -59.5 | -40.9 | -0.4 | 2.2 | 0.9 | -13.1 | -13.4 |
| |
| Net loss per share — | | | | | | | | |
| Basic and diluted (in dollars per share) | ($1.35) | ($1.40) | ($0.98) | ($0.01) | $0.06 | $0.03 | ($0.39) | ($0.41) |
| |
| Other comprehensive income (loss), net of tax | | | | | | | | |
| Foreign currency translation adjustments | -3.8 | -0.6 | -1.0 | 0.3 | 0.1 | -0.3 | -0.4 | 0.1 |
| Comprehensive loss, net of tax | -61.9 | -60.1 | -41.9 | -0.1 | 2.3 | 0.6 | -13.5 | -11.2 |
| |
| Weighted average common shares outstanding — | | | | | | | | |
| Basic and diluted (in shares) | 42.9 | 42.4 | 41.7 | 38.9 | | | | |