| In millions, except per share items | Apr-30-22 | Apr-30-21 | Apr-30-20 | Apr-30-19 | Apr-30-18 | Apr-30-17 | Apr-30-16 | Apr-30-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| ASSETS | | | | | | | | |
| Current assets: | | | | | | | | |
| Cash | 9.0 | 4.7 | 8.3 | 3.2 | 0.9 | 3.3 | 2.6 | 9.4 |
| Accounts receivable, net | 9.5 | 7.0 | 4.8 | 4.4 | 3.9 | 2.3 | 1.3 | 1.1 |
| Prepaid expenses and other current assets | 1.1 | 1.0 | 0.4 | 0.3 | 0.3 | 0.3 | 0.4 | 0.3 |
| Total current assets | 19.7 | 12.6 | 13.5 | 7.9 | 5.1 | 5.9 | 4.3 | 10.8 |
| Operating lease right-of-use assets, net | 8.2 | 8.5 | 2.8 | | | | | |
| Other long-term assets | 0.0 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 | | |
| Goodwill | 0.3 | 0.3 | 0.3 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 |
| Total assets | 35.4 | 27.6 | 20.8 | 11.3 | 8.1 | 8.0 | 5.8 | 12.0 |
| |
| LIABILITIES AND STOCKHOLDERS’ EQUITY | | | | | | | | |
| Current liabilities: | | | | | | | | |
| Accounts payable | 2.9 | 1.9 | 3.1 | 2.8 | 2.2 | 1.9 | 1.9 | 1.4 |
| Accrued liabilities | 2.4 | 2.2 | 2.7 | 1.2 | 0.6 | 0.7 | 0.3 | 0.4 |
| Current portion of operating lease liabilities | 1.1 | 0.8 | 0.5 | | | | | |
| Deferred revenue | 11.1 | 6.3 | 5.8 | 4.0 | | | | |
| Total current liabilities | 17.5 | 11.2 | 12.3 | 8.0 | 7.5 | 7.4 | 5.3 | 3.8 |
| Other non-current liabilities | 0.4 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Total liabilities | 26.3 | 20.2 | 15.7 | 9.0 | 8.1 | 7.6 | 5.5 | 4.0 |
| |
| Stockholders’ equity: | | | | | | | | |
| Common stock | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Additional paid-in capital | 81.1 | 79.9 | 78.0 | 72.9 | 72.1 | 71.0 | 63.9 | 61.3 |
| Accumulated deficit | -72.0 | -72.5 | -72.9 | -70.7 | -70.8 | -69.4 | -62.5 | -52.0 |
| Total stockholders’ equity | 9.1 | 7.4 | 5.1 | 2.2 | 0.0 | 0.4 | 0.2 | 8.1 |
| Total liabilities and stockholders’ equity | 35.4 | 27.6 | 20.8 | 11.3 | 8.1 | 8.0 | 5.8 | 12.0 |