| In millions, except per share items | Jun-30-21 | Mar-31-21 | Jun-30-20 | Mar-31-20 | Dec-31-19 | Sep-30-19 | Jun-30-19 | Mar-31-19 |
| | 10-Q | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q |
| Net income | -9.1 | -9.7 | 24.0 | -22.8 | -15.7 | -15.3 | -14.3 | -16.1 |
| Depreciation and amortization [+] | 1.2 | 1.2 | 1.2 | 1.1 | 0.8 | 0.7 | 0.6 | 0.5 |
| Depreciation | 1.2 | 1.2 | 1.2 | 1.1 | 0.8 | 0.7 | 0.6 | 0.5 |
| Asset impairment charges | | | | 3.5 | | | | |
| Stock-based compensation | 1.5 | 2.5 | 1.9 | 2.1 | 1.8 | 1.8 | 1.9 | 1.9 |
| Change in working capital [+] | 3.6 | -3.6 | -3.0 | -0.9 | -0.6 | 2.0 | -1.3 | -4.9 |
| Accounts receivable | 1.0 | -1.7 | 0.0 | 0.7 | -0.1 | 0.1 | -0.7 | 0.6 |
| Inventories | | 0.2 | 0.4 | -0.1 | 0.0 | 0.1 | 0.2 | -1.0 |
| Other current assets | -0.1 | 0.2 | -1.1 | -1.4 | -1.0 | 0.3 | 0.1 | -0.3 |
| Accounts payable | 0.6 | 0.2 | -2.2 | 1.6 | 0.1 | 0.8 | 2.5 | -1.6 |
| Accrued expenses | 2.2 | -2.4 | -0.1 | -1.7 | 0.4 | 0.6 | -3.3 | -2.7 |
| Other operating activities | 0.2 | 0.2 | 0.0 | 0.0 | 0.1 | -0.1 | 0.0 | -0.1 |
| Cash from operations | -2.6 | -9.4 | 24.2 | -17.1 | -13.7 | -10.9 | -13.1 | -18.7 |
| |
| Capital expenditures [+] | -0.1 | -0.3 | -1.5 | -1.4 | -1.1 | -0.6 | -4.0 | -2.7 |
| Purchases of property and equipment | -0.1 | -0.3 | -1.5 | -1.4 | -1.1 | -0.6 | -4.0 | -2.7 |
| Sales of property and equipment | | | 0.0 | | 0.0 | | | 0.0 |
| Purchases of short-term investments, net | 22.7 | -2.2 | -10.0 | 17.0 | -9.0 | -0.7 | -20.0 | -9.7 |
| Purchases of short-term investments | -13.4 | -18.5 | -35.1 | -16.7 | -35.9 | -39.7 | -29.1 | -20.3 |
| Sales of short-term investments | 36.1 | 16.2 | 25.1 | 33.8 | 27.0 | 39.0 | 9.1 | 10.6 |
| Cash from investing | 22.7 | -2.5 | -11.4 | 15.6 | -10.1 | -1.3 | -24.0 | -12.3 |
| |
| Issuance of common stock, net | 13.2 | 13.7 | | | | | | 43.1 |
| Option exercises | 0.8 | 0.0 | 0.1 | 0.1 | 0.7 | 0.2 | 0.5 | 0.7 |
| Other cash from financing | 1.4 | -0.5 | 0.3 | -0.4 | 1.3 | 19.6 | 1.1 | 0.8 |
| Cash from financing | 13.8 | 13.2 | 0.1 | -0.5 | 0.7 | 19.4 | 0.5 | 43.3 |
| |
| Free cash flow | -2.7 | -9.7 | 22.8 | -18.5 | -14.8 | -11.5 | -17.1 | -21.3 |
| Per share (diluted) | ($0.06) | ($0.24) | $0.57 | ($0.47) | ($0.38) | ($0.30) | ($0.44) | ($0.56) |