| In millions, except per share items | Jun-30-21 | Mar-31-21 | Dec-31-20 | Sep-30-20 | Jun-30-20 | Mar-31-20 | Dec-31-19 | Sep-30-19 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Net income | -13.2 | -11.8 | -11.9 | -3.2 | -17.3 | -12.7 | -20.4 | -13.8 |
| Depreciation and amortization [+] | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 |
| Depreciation | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Amortization of intangible assets | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 |
| Stock-based compensation | 2.1 | 2.3 | 1.8 | 2.1 | 1.8 | 1.8 | 1.5 | 2.2 |
| Change in working capital [+] | 0.4 | -6.2 | 6.6 | 0.7 | -5.3 | -5.2 | 23.0 | 6.8 |
| Accounts receivable | -0.7 | 0.0 | 0.1 | 0.0 | -0.2 | -0.4 | 1.1 | 3.0 |
| Inventories | 0.3 | -0.9 | 0.6 | 0.2 | 0.2 | 0.1 | 0.4 | 0.8 |
| Other current assets | 0.2 | -1.0 | 0.5 | 0.5 | -0.8 | 0.1 | 0.9 | 0.4 |
| Accounts payable | -5.1 | 4.3 | -0.1 | -0.4 | -3.3 | 2.0 | 1.4 | 0.5 |
| Accrued expenses | 5.7 | -8.6 | 1.7 | 0.4 | -1.2 | -6.9 | 2.1 | 2.2 |
| Other | | | 3.9 | | | | 17.2 | |
| Other operating activities | -0.3 | 1.1 | -2.7 | -6.6 | 7.4 | -0.4 | -7.1 | -3.2 |
| Cash from operations | -9.8 | -13.4 | -5.0 | -5.8 | -12.1 | -15.2 | -1.6 | -6.7 |
| |
| Capital expenditures | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Purchases of property and equipment | | 0.0 | | 0.0 | | | 0.0 | 0.0 |
| Sales of short-term investments, net [+] | | | | | 6.3 | 14.8 | 19.7 | -12.4 |
| Purchases of short-term investments | | | | | | | -11.4 | -16.8 |
| Sales of short-term investments | | | | | 6.3 | 14.8 | 31.1 | 4.4 |
| Cash from investing | 0.0 | 0.0 | 0.0 | 0.0 | 6.3 | 14.8 | 19.6 | -12.4 |
| |
| Issuance of common stock, net | | | 5.5 | 23.1 | | | | |
| Option exercises | | 0.1 | | | | | | 0.0 |
| Other cash from financing | -0.3 | -0.1 | 5.2 | 4.5 | 9.2 | -0.1 | | 0.0 |
| Cash from financing | -0.3 | -0.2 | 10.7 | 27.7 | 9.2 | -0.1 | 0.0 | 0.0 |
| |
| Free cash flow | -9.8 | -13.4 | -5.0 | -5.8 | -12.1 | -15.2 | -1.6 | -6.7 |
| Per share (diluted) | ($0.14) | ($0.20) | ($0.09) | ($0.10) | ($0.22) | ($0.28) | ($0.03) | ($0.12) |
| |
| Cash paid for interest | 0.5 | 0.5 | 0.3 | 0.3 | 0.1 | | | |
| Cash paid for income taxes | | 1.3 | 0.0 | 0.2 | 0.5 | | | |