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 | -13.9 | -21.7 | -46.5 | -4.1 | -49.0 | -38.9 | -33.5 | -23.1 |
Depreciation and amortization [+] | | | 0.1 | 0.0 | 0.6 | 0.3 | 0.3 | 0.2 |
Depreciation | | | 0.1 | 0.0 | 0.6 | 0.3 | 0.3 | 0.2 |
Stock-based compensation | | | 1.0 | 0.0 | 6.9 | 4.5 | 1.3 | 1.1 |
Change in working capital [+] | 2.6 | 3.8 | -3.8 | 1.3 | 5.2 | 2.6 | 2.0 | 0.7 |
Other current assets | | | -0.3 | 0.0 | -0.2 | -0.7 | -0.2 | -1.1 |
Accounts payable | | | -0.4 | 1.0 | 1.3 | 0.3 | 0.6 | 0.6 |
Accrued expenses | | | -3.2 | 0.3 | 4.1 | 2.9 | 1.5 | 1.3 |
Deferred revenues | | | | | | | | -0.1 |
Other | 2.6 | 3.8 | | | | | | |
Other operating activities | 3.1 | 1.2 | 30.9 | | 1.8 | 0.5 | 0.4 | 0.0 |
Cash from operations | -8.2 | -16.7 | -18.4 | -2.8 | -34.5 | -31.1 | -29.5 | -21.0 |
|
Capital expenditures [+] | 0.0 | 0.0 | 0.0 | -0.2 | -2.0 | -0.7 | -0.5 | -0.2 |
Purchases of property and equipment | | | | -0.2 | -2.0 | -0.7 | -0.5 | -0.2 |
Sales of property and equipment | | | | | | 0.0 | | 0.0 |
Purchases of short-term investments, net | | | | | -2.2 | -27.1 | 25.1 | -24.7 |
Purchases of short-term investments | | | | | -70.7 | -70.8 | -23.0 | -59.9 |
Sales of short-term investments | | | | | 68.5 | 43.7 | 48.1 | 35.2 |
Other cash from investing | | | 3.6 | | | | | |
Cash from investing | 0.0 | 0.0 | 3.6 | -0.2 | -4.2 | -27.7 | 24.6 | -24.9 |
|
Issuance of common stock, net | 7.2 | | 66.7 | | 0.7 | 0.5 | 0.0 | 0.2 |
Option exercises | | | 0.3 | | | | | |
Financing costs | | | -0.3 | | | | | |
Other cash from financing | 0.0 | 0.0 | -0.1 | 4.9 | 42.9 | 88.8 | 2.3 | 49.8 |
Cash from financing | 7.2 | 0.0 | 66.7 | 4.9 | 43.5 | 89.3 | 2.3 | 49.9 |
|
Free cash flow | -8.2 | -16.7 | -18.4 | -2.9 | -36.4 | -31.8 | -30.1 | -21.3 |
Per share (diluted) | ($0.47) | ($1.19) | ($2.50) | ($1.39) | ($1.82) | ($2.18) | ($13.67) | ($9.75) |
|
Cash paid for interest | | | | | 1.5 | 1.2 | 1.5 | 0.1 |