In millions, except per share items | Jun-30-23 | Mar-31-23 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 |
| 10-K | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
Current assets | | | | | | | | |
Short-term investments | 27.9 | 29.7 | 30.7 | 26.2 | 26.6 | 27.1 | 27.3 | 27.4 |
Accounts receivable | 0.2 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.2 | 0.0 |
Contract asset | | | | 0.0 | | | | |
|
Inventory, net: | | | | | | | | |
Raw materials | 1.4 | 1.2 | 0.9 | 0.9 | 1.1 | 1.1 | 1.3 | 1.1 |
Work-in-process | 0.2 | 0.1 | 0.1 | 0.1 | 0.0 | 0.0 | 0.1 | 0.1 |
Finished goods | 0.4 | 0.5 | 0.5 | 0.5 | 0.3 | 0.3 | 0.3 | 0.3 |
Income tax receivable | 0.0 | | | | | | | |
Prepaid expenses and other current assets | 0.4 | 0.9 | 0.9 | 0.7 | 0.6 | 0.5 | 0.2 | 0.3 |
Total current assets | 44.7 | 46.9 | 51.4 | 55.0 | 57.1 | 59.3 | 61.0 | 65.1 |
Property and equipment, net | 2.7 | 2.2 | 1.4 | 1.1 | 0.9 | 0.9 | 0.3 | 0.3 |
Other assets, net | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
Total assets | 47.7 | 49.4 | 52.9 | 56.2 | 58.3 | 60.4 | 61.6 | 65.6 |
|
Current liabilities | | | | | | | | |
Accounts payable | 0.5 | 0.3 | 0.3 | 0.2 | 0.1 | 0.1 | 0.1 | 0.4 |
Payroll related accruals | 0.6 | 0.9 | 0.5 | 0.8 | 0.9 | 0.7 | 0.5 | 0.3 |
Accrued expenses and other liabilities | 1.2 | 0.9 | 0.9 | 1.0 | 0.9 | 0.9 | 0.7 | 0.9 |
Income tax payable | | | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
|
Term note payable - related party | | | | | | | | |
Lease liabilities, current | 0.3 | 0.3 | 0.2 | 0.2 | 0.2 | 0.2 | | 0.1 |
Total current liabilities | 2.7 | 2.3 | 1.9 | 2.7 | 2.6 | 2.4 | 1.9 | 4.2 |
Lease liabilities, net of current portion | 0.3 | 0.3 | 0.2 | 0.3 | 0.4 | 0.4 | 0.2 | 0.2 |
Total liabilities | 3.0 | 2.6 | 2.1 | 3.0 | 3.0 | 2.8 | 2.1 | 4.4 |
|
Commitments and contingencies (Note 14) | | | | | | | | |
Stockholders’ equity | | | | | | | | |
Common stock | 190.6 | 190.6 | 190.6 | 190.6 | 190.6 | 190.6 | 190.6 | 190.6 |
Additional paid-in capital | 81.0 | 80.7 | 79.9 | 79.5 | 79.1 | 78.8 | 78.3 | 78.0 |
Accumulated deficit | -225.4 | -223.0 | -218.2 | -215.7 | -213.7 | -211.6 | -209.4 | -207.4 |
Accumulated other comprehensive loss | -1.5 | -1.4 | -1.6 | -1.2 | -0.8 | -0.3 | -0.1 | 0.0 |
Total stockholders’ equity | 44.7 | 46.8 | 50.7 | 53.2 | 55.3 | 57.6 | 59.5 | 61.2 |
Total liabilities and stockholders’ equity | 47.7 | 49.4 | 52.9 | 56.2 | 58.3 | 60.4 | 61.6 | 65.6 |