In millions, except per share items | Dec-31-22 | Dec-05-22 | Dec-31-21 | Dec-05-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 |
| 10-K | 8-K | 10-K | 8-K | 10-K | 10-K | 10-K | 10-K |
Net income | -35.3 | -35.3 | -36.3 | -36.3 | -0.6 | -21.4 | -25.3 | -3.7 |
Depreciation and amortization | 0.1 | | 0.3 | | 0.3 | 0.3 | 0.3 | 0.4 |
Asset impairment charges | | | | | | 0.3 | 0.3 | 2.3 |
Stock-based compensation | | | | | | 2.1 | 3.0 | 2.6 |
Change in working capital [+] | 1.2 | | 2.3 | | -2.0 | 8.8 | 6.9 | -43.3 |
Accounts receivable | | | | | | -0.6 | 0.6 | -1.2 |
Inventories | | | | | | -0.2 | -0.5 | -0.1 |
Other current assets | | | | | | 0.8 | 0.0 | -1.1 |
Accounts payable | | | | | | 0.5 | 0.1 | -0.6 |
Accrued expenses | | | | | | 5.1 | 1.6 | 1.6 |
Other | 1.2 | | 2.3 | | -2.0 | 3.1 | 5.1 | -41.9 |
Other operating activities | 7.8 | | -3.6 | | -36.4 | 21.0 | -4.8 | 40.4 |
Cash from operations | -26.3 | | -37.3 | | -38.7 | 11.1 | -19.8 | -1.3 |
|
Capital expenditures | 0.1 | | 0.2 | | 0.2 | -0.2 | -0.1 | -0.1 |
Purchases of property and equipment | 0.1 | | 0.2 | | 0.2 | -0.2 | -0.1 | -0.1 |
Sales of short-term investments, net [+] | 19.9 | | 105.1 | | 99.8 | -27.2 | 4.6 | 12.3 |
Purchases of short-term investments | | | 52.3 | | 45.1 | -31.9 | -9.6 | -8.4 |
Sales of short-term investments | 19.9 | | 52.8 | | 54.7 | 4.7 | 14.2 | 20.6 |
Other cash from investing | -0.2 | | -90.0 | | -90.5 | | | 0.5 |
Cash from investing | 19.8 | | 15.3 | | 9.4 | -27.3 | 4.5 | 12.7 |
|
Issuance of common stock, net | 0.0 | | 47.7 | | 12.3 | 18.4 | 16.8 | 12.0 |
Option exercises | 0.1 | | 3.6 | | 3.4 | 2.0 | 1.7 | 0.6 |
Other cash from financing | 0.1 | | 6.5 | | 6.8 | 3.1 | 2.4 | 1.3 |
Cash from financing | 0.1 | | 50.5 | | 15.7 | 19.5 | 17.5 | 12.6 |
|
Free cash flow | -26.2 | | -37.1 | | -38.5 | 10.9 | -19.8 | -1.4 |
Per share (diluted) | ($1.15) | | ($1.65) | | ($1.93) | $0.06 | ($0.12) | ($0.01) |
|
Cash paid for interest | 1.8 | | 1.6 | | 1.7 | 1.9 | 1.9 | 1.7 |