| 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 |
| ASSETS | | | | | | | | |
| Cash and Cash Equivalents | 13.3 | 48.7 | 11.8 | 22.7 | 8.4 | 17.2 | 31.2 | 65.8 |
| Investments Available-for-Sale | 9.2 | 10.0 | 14.3 | 10.8 | 24.6 | 40.8 | 39.5 | 19.9 |
| Accounts Receivable, net | 5.9 | 4.2 | 4.2 | 7.0 | 6.4 | 6.4 | 5.0 | 4.5 |
| Inventory | 4.1 | 3.9 | 3.6 | 4.0 | 7.6 | 12.1 | 7.9 | 3.9 |
| Prepaid and Other Current Assets | 2.9 | 2.7 | 3.0 | 1.9 | 1.8 | 2.0 | 1.0 | 0.6 |
| Total Current Assets | 35.3 | 69.5 | 36.9 | 46.8 | 48.8 | 78.5 | 84.6 | 94.7 |
| Property and Equipment, net | 2.5 | 2.6 | 2.4 | 2.6 | 2.5 | 1.4 | 1.6 | 1.5 |
| Inventory, Non-Current | 1.5 | 1.2 | 0.4 | 1.6 | 6.0 | 1.8 | | |
| Goodwill | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 |
| Other Non-Current Assets | 0.6 | 0.6 | 0.4 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Total Assets | 48.6 | 77.7 | 44.3 | 52.6 | 58.8 | 83.2 | 87.8 | 98.0 |
| |
| LIABILITIES AND STOCKHOLDERS’ EQUITY | | | | | | | | |
| Accounts Payable | 3.7 | 4.2 | 3.0 | 4.5 | 4.2 | 5.9 | 4.0 | 5.3 |
| Accrued Liabilities | 5.1 | 5.0 | 4.5 | 5.1 | 4.7 | 4.2 | 3.8 | 4.3 |
| Term Loan - Net of Issuance Costs | 7.4 | | | | | | | |
| Insurance Financing Note Payable | 0.4 | | 0.8 | | | | | |
| Customer Deposits | 0.1 | 0.2 | 0.1 | 0.1 | 0.2 | 0.1 | 0.3 | 0.2 |
| Total Current Liabilities | 21.0 | 12.8 | 12.4 | 13.2 | 9.1 | 10.1 | 8.1 | 9.8 |
| Term Loan, Net of Issuance Costs | 13.2 | 20.9 | | | | | | |
| Deferred License Revenue - Long-Term | 6.0 | 8.0 | 9.8 | 12.1 | | | | |
| Long Term Liability - Other | 0.0 | | | | | | | |
| Total Liabilities | 46.0 | 43.6 | 24.0 | 25.3 | 25.9 | | | |
| |
| Stockholders’ Equity: | | | | | | | | |
| Common Stock | 0.0 | 0.0 | 0.0 | 0.0 | 273.2 | 268.2 | 257.8 | 249.0 |
| Additional Paid-in Capital | 372.6 | 371.5 | 326.8 | 299.6 | | | | |
| Accumulated Deficit | -370.1 | -337.4 | -306.5 | -272.4 | -240.3 | -214.3 | -194.5 | -180.1 |
| Accumulated Other Comprehensive Income | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | -0.9 | -0.9 | -0.2 |
| Total Stockholders’ Equity | 2.5 | 34.2 | 20.3 | 27.3 | 32.9 | 53.0 | 62.3 | 68.7 |
| Total Liabilities and Stockholders’ Equity | 48.6 | 77.7 | 44.3 | 52.6 | 58.8 | 83.2 | 87.8 | 98.0 |