| In millions, except per share items | Mar-31-20 | Dec-31-19 | Sep-30-19 | Jun-30-19 | Mar-31-19 | Dec-31-18 | Sep-30-18 | Jun-30-18 |
| | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| Net income | -21.3 | -17.7 | -14.9 | -16.8 | -27.4 | -26.6 | -21.0 | -18.9 |
| Depreciation and amortization [+] | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Depreciation | 0.0 | 0.0 | -0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Stock-based compensation | 4.5 | 5.2 | 5.4 | 8.3 | 7.2 | 5.3 | 3.1 | 3.4 |
| Change in working capital [+] | 3.1 | 1.6 | -3.5 | -12.4 | -2.5 | 2.9 | -0.7 | -2.5 |
| Accounts receivable | 3.2 | 1.5 | -1.5 | -9.5 | -5.6 | | | |
| Inventories | -0.2 | 1.5 | 1.2 | -2.8 | -0.8 | | | |
| Other current assets | 0.2 | -1.9 | 1.0 | -0.5 | -0.2 | -1.0 | 0.2 | -1.1 |
| Other | -0.1 | 0.6 | -4.3 | 0.3 | 4.1 | 3.9 | -0.9 | -1.3 |
| Other operating activities | 0.0 | -0.4 | -0.3 | -0.3 | 0.5 | 0.0 | 0.0 | 0.0 |
| Cash from operations | -13.8 | -11.2 | -13.2 | -21.2 | -22.1 | -18.4 | -18.7 | -18.0 |
| |
| Capital expenditures | 0.0 | 0.1 | 0.0 | 0.0 | -0.1 | 0.1 | -0.1 | 0.0 |
| Purchases of property and equipment | 0.0 | 0.1 | | | -0.1 | 0.1 | -0.1 | |
| Purchases of short-term investments, net | 29.3 | 179.6 | -60.1 | 13.8 | -49.6 | 57.8 | 13.4 | 10.8 |
| Purchases of short-term investments | -10.0 | 179.6 | -89.6 | -8.5 | -81.5 | 57.8 | -3.5 | -9.6 |
| Sales of short-term investments | 39.3 | | 29.5 | 22.4 | 31.9 | | 16.9 | 20.4 |
| Other cash from investing | | -183.0 | | | | -41.6 | | |
| Cash from investing | 29.3 | -3.3 | -60.1 | 13.8 | -49.6 | 16.3 | 13.3 | 10.8 |
| |
| Issuance of common stock, net | | | 82.2 | | 86.2 | -0.1 | 0.0 | 8.3 |
| Option exercises | 0.0 | 0.6 | 1.2 | 0.3 | 0.0 | | 0.1 | 0.4 |
| Other cash from financing | 0.2 | 1.3 | 2.7 | 0.6 | 0.1 | 0.0 | 0.1 | 1.0 |
| Cash from financing | 0.2 | 0.7 | 83.6 | 0.3 | 86.3 | 0.0 | 0.1 | 8.8 |
| |
| Free cash flow | -13.8 | -11.1 | -13.2 | -21.2 | -22.2 | -18.3 | -18.8 | -18.0 |
| Per share (diluted) | ($0.29) | ($0.26) | ($0.30) | ($0.53) | ($0.59) | ($0.65) | ($0.65) | ($0.63) |