In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 |
| 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
Net income | -51.2 | -44.7 | -44.7 | -50.4 | -90.1 | -110.6 | -61.7 | -42.9 |
Depreciation and amortization [+] | | | | 1.2 | 1.3 | 0.7 | 0.4 | 0.2 |
Depreciation | | | | 1.2 | 1.3 | 0.7 | 0.4 | 0.2 |
Asset impairment charges | | | | | 0.4 | 0.6 | | |
Stock-based compensation | | | | 12.4 | 13.7 | 12.6 | 7.7 | 1.7 |
Change in working capital [+] | 9.7 | 9.2 | 6.8 | -1.2 | -18.7 | 43.5 | 21.8 | 2.4 |
Accounts receivable | | | | | 0.0 | -0.1 | | |
Inventories | | | | | | -1.7 | | |
Other current assets | | | | -0.5 | 2.8 | -0.6 | -2.2 | 0.0 |
Accounts payable | | | | 0.1 | -0.4 | -2.2 | 1.7 | -0.3 |
Accrued expenses | | | | -0.2 | -5.5 | 3.9 | 1.0 | 2.5 |
Other | 9.7 | 9.2 | 6.8 | -0.6 | -15.6 | 44.3 | 21.4 | 0.3 |
Other operating activities | -1.0 | -3.3 | 0.9 | -0.5 | 18.2 | -41.2 | -18.1 | |
Cash from operations | -42.4 | -38.9 | -36.9 | -38.4 | -75.3 | -94.3 | -49.9 | -35.2 |
|
Capital expenditures [+] | 0.3 | 0.1 | 0.7 | -0.5 | -1.3 | -2.5 | -2.0 | -0.8 |
Purchases of property and equipment | 0.3 | 0.1 | 0.7 | -0.5 | -1.3 | -2.5 | -2.0 | -0.8 |
Sales of property and equipment | 0.8 | | | | | | | |
Sales of short-term investments, net [+] | 55.5 | 48.5 | 114.0 | 38.5 | 70.3 | -146.9 | -10.0 | -16.2 |
Purchases of short-term investments | | | | -104.3 | -129.3 | -261.2 | -41.3 | -16.2 |
Sales of short-term investments | 55.5 | 48.5 | 114.0 | 142.8 | 199.6 | 114.4 | 31.4 | |
Other cash from investing | -0.6 | -68.8 | -86.4 | | | | | 0.1 |
Cash from investing | 56.0 | -20.2 | 28.3 | 38.0 | 69.0 | -149.4 | -12.0 | -16.9 |
|
Issuance of common stock, net | | | | | 0.4 | 108.9 | 80.7 | 104.1 |
Option exercises | 0.0 | 0.2 | 0.0 | 0.0 | 0.6 | 0.4 | 0.6 | 0.2 |
Financing costs | | | 0.1 | | | | | |
Other cash from financing | 33.1 | 64.9 | 0.3 | 15.2 | 1.2 | 0.7 | 1.3 | 50.7 |
Cash from financing | 33.1 | 64.7 | 0.2 | 15.2 | 1.1 | 109.2 | 81.4 | 154.7 |
|
Free cash flow | -42.1 | -38.7 | -36.2 | -38.9 | -76.6 | -96.9 | -51.9 | -36.0 |
Per share (diluted) | ($0.66) | ($0.95) | ($1.18) | ($1.27) | ($2.53) | ($3.23) | ($2.17) | ($4.58) |
|
Cash paid for interest | 1.4 | 1.4 | 1.4 | 0.0 | | | | |