| In millions, except per share items | Jun-30-22 | Jun-30-21 | Jun-30-20 | Jun-30-19 | Jun-30-18 | Jun-30-17 | Jun-30-16 | Jun-30-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Current assets: | | | | | | | | |
| Cash and cash equivalents | | | | | | | | |
| Trade accounts receivable, net of allowance of $20,686 and $36,313 | 5.2 | 4.7 | 6.2 | 6.2 | 5.4 | 5.9 | 3.5 | 3.0 |
| Inventories, net | 7.0 | 8.7 | 9.0 | 7.7 | 6.4 | 5.1 | 3.8 | 3.2 |
| Prepaid expenses and other assets | 0.5 | 0.5 | 0.6 | 0.8 | 1.1 | 0.6 | 0.7 | 0.2 |
| Total current assets | 18.2 | 20.7 | 21.3 | 19.6 | 19.4 | 19.7 | 11.2 | 8.4 |
| Property and equipment, net | 11.6 | 13.3 | 11.8 | 11.7 | 11.8 | 10.3 | 4.4 | 4.3 |
| Operating lease right-of-use assets | 10.4 | 9.0 | 1.2 | | | | | |
| Intangible assets, net | 4.5 | 5.6 | 6.7 | 7.8 | 9.1 | 10.4 | | |
| Goodwill | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | | |
| |
| Deferred tax assets, net | | | | | | | | |
| Other assets | 0.0 | 0.0 | 0.1 | 0.3 | 0.4 | 0.1 | 0.1 | 0.1 |
| Total assets | 50.7 | 54.6 | 47.6 | 46.0 | 47.1 | 46.7 | 15.6 | 12.7 |
| |
| Liabilities and Stockholders' Equity | | | | | | | | |
| Current liabilities: | | | | | | | | |
| Accounts payable | 3.1 | 2.9 | 2.6 | 2.2 | 2.0 | 1.5 | 1.4 | 1.6 |
| Accrued liabilities | 2.1 | 2.8 | 1.8 | 1.7 | 1.2 | 1.9 | 1.4 | 0.8 |
| Accrued payroll and benefits | 2.1 | 2.8 | 1.8 | 1.7 | 1.2 | 1.9 | 1.4 | 0.8 |
| Operating lease liabilities, current | 1.0 | 0.8 | 0.8 | | | | | |
| Loans payable, current portion | 1.0 | 0.6 | 1.0 | 0.6 | 1.5 | 1.1 | | 0.1 |
| Total current liabilities | 7.7 | 8.4 | 7.4 | 6.4 | 5.8 | 5.8 | 3.2 | 2.7 |
| |
| Deferred tax liabilities, net | | | | | | | | |
| Finance lease obligation, less current portion | | | | | | | | |
| Operating lease liabilities, noncurrent | | | | | | | | |
| Loans payable, less current portion | | | | | | | | |
| Total liabilities | 21.0 | 21.0 | 13.0 | 12.5 | 11.8 | 17.0 | 4.7 | 4.7 |
| |
| Commitments and Contingencies | | | | | | | | |
| Stockholders' equity: | | | | | | | | |
| Common stock: Class A | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.2 | 0.2 | 0.2 |
| Additional paid-in capital | 232.3 | 231.4 | 230.6 | 230.3 | 229.9 | 225.5 | 214.7 | 213.2 |
| Accumulated other comprehensive income | 0.9 | 2.1 | 0.7 | 0.8 | 0.5 | 0.3 | 0.1 | 0.1 |
| Accumulated deficit | -203.8 | -200.2 | -197.1 | -197.9 | -195.2 | -196.3 | -204.0 | -205.4 |
| Total stockholders' equity | 29.7 | 33.6 | 34.6 | 33.5 | 35.4 | 29.7 | 10.9 | 8.0 |
| Total liabilities and stockholders' equity | 50.7 | 54.6 | 47.6 | 46.0 | 47.1 | 46.7 | 15.6 | 12.7 |