In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
Net income | -23.2 | -15.2 | -11.9 | -19.7 | 62.7 | -5.1 | -4.0 | 8.4 |
Depreciation and amortization | 0.9 | 0.9 | 0.9 | 0.8 | 0.7 | 0.7 | 0.7 | 0.8 |
Asset impairment charges | 0.2 | 0.1 | 0.5 | 0.1 | | | | 0.2 |
Stock-based compensation | 6.7 | 5.1 | 4.2 | 3.6 | 2.2 | 0.9 | 0.8 | 0.6 |
Deferred taxes | | | | | -0.4 | -0.2 | 0.0 | 0.0 |
Change in working capital [+] | -5.2 | -1.8 | -10.3 | -3.3 | -17.7 | 0.0 | -0.8 | -0.5 |
Accounts receivable | 1.9 | -4.9 | -0.6 | -4.0 | -0.4 | -0.3 | -1.9 | -1.0 |
Inventories | -5.6 | -2.9 | 0.6 | -2.4 | 1.2 | -0.4 | -0.2 | -0.1 |
Other current assets | -0.5 | 1.4 | 0.0 | 0.6 | -2.9 | 0.0 | 0.1 | 0.3 |
Accounts payable | 0.1 | 1.2 | -1.0 | 1.1 | -0.2 | 0.0 | 0.4 | -0.2 |
Accrued expenses | -1.2 | 3.4 | -2.1 | 2.4 | -15.3 | 0.7 | 0.8 | 0.6 |
Other | 0.1 | 0.0 | -7.2 | -1.0 | | | | |
Other operating activities | 0.3 | 0.5 | 0.5 | 0.1 | -68.4 | 0.0 | 0.4 | -15.2 |
Cash from operations | -20.3 | -10.4 | -16.1 | -18.5 | -20.9 | -3.7 | -2.8 | -5.8 |
|
Capital expenditures | -1.0 | -0.7 | -0.6 | -1.3 | -0.4 | -0.6 | -0.3 | -0.4 |
Purchases of property and equipment | -1.0 | -0.7 | -0.6 | -1.3 | -0.4 | -0.6 | -0.3 | -0.4 |
Sales of short-term investments, net [+] | | | | 61.8 | -61.4 | | | |
Purchases of short-term investments | | | | -18.9 | -87.2 | | | |
Sales of short-term investments | | | | 80.7 | 25.8 | | | |
Other cash from investing | | | | | 91.1 | | | -0.5 |
Cash from investing | -1.0 | -0.7 | -0.6 | 60.5 | 29.3 | -0.6 | -0.3 | -0.9 |
|
Issuance of common stock, net | | | | | | | 5.8 | 11.5 |
Option exercises | 0.4 | 0.1 | 0.1 | 0.2 | 0.2 | | 0.0 | 0.2 |
Other cash from financing | 0.6 | 0.1 | 0.1 | 0.4 | -2.3 | -0.2 | -0.1 | 1.5 |
Cash from financing | 0.2 | 0.0 | -0.1 | 0.1 | -2.5 | -0.2 | 5.7 | 12.8 |
|
Free cash flow | -21.3 | -11.2 | -16.6 | -19.8 | -21.2 | -4.3 | -3.1 | -6.2 |
Per share (diluted) | ($0.62) | ($0.33) | ($0.49) | ($0.58) | ($0.62) | ($0.14) | ($0.11) | ($0.22) |
|
Cash paid for interest | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 | 0.2 | 0.2 |