In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
Operating activities: | | | | | | | | |
Net loss | -7.6 | -7.6 | -9.1 | -8.9 | -9.2 | -8.5 | -7.8 | -8.1 |
Adjustments to reconcile net loss to net cash used in operating activities: | | | | | | | | |
Depreciation expense | 0.1 | 0.1 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 |
Stock-based compensation expense | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.3 | 0.3 | 0.3 |
Non-cash lease expense | 0.4 | 0.4 | | | 0.3 | 0.3 | | |
Non-cash interest and other expense, net | 0.0 | 0.1 | | | 0.2 | 0.1 | | |
Changes in operating assets and liabilities: | | | | | | | | |
Prepaid expenses and other assets | 0.4 | 0.0 | 1.3 | -0.8 | 0.3 | 0.2 | -0.4 | -0.8 |
Accounts payable | -0.3 | 0.0 | 0.1 | -0.5 | 0.8 | -0.3 | -1.3 | -4.3 |
Accrued expenses and other liabilities | 0.3 | -1.2 | 0.8 | 0.6 | -0.7 | 1.1 | 1.1 | 0.8 |
Interest payable | 0.0 | 0.0 | -0.3 | 0.0 | 0.0 | 0.0 | 0.0 | |
Operating lease liabilities | -0.2 | -0.5 | -0.3 | -0.4 | -0.5 | -0.3 | -0.3 | -0.3 |
Cash used in operating activities | -6.4 | -8.3 | -6.5 | -9.1 | -8.4 | -7.1 | -8.0 | -11.8 |
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Investing activities: | | | | | | | | |
Purchase of property and equipment | -0.1 | 0.0 | -0.4 | -0.1 | -0.1 | 0.0 | 0.0 | 0.0 |
Cash used in investing activities | -0.1 | 0.0 | -0.4 | -0.1 | -0.1 | 0.0 | 0.0 | 0.0 |
|
Financing activities: | | | | | | | | |
Proceeds from the issuance of common stock, net of issuance costs | 1.2 | 0.0 | 0.0 | 0.4 | 7.1 | 1.4 | 0.0 | 3.5 |
Proceeds from the issuance of pre-funded warrants, net of issuance costs | | | 0.0 | 0.0 | 7.3 | | | |
Cash provided by financing activities | 1.2 | 0.0 | -4.7 | 0.4 | 14.4 | 1.4 | 0.0 | 3.2 |
Net decrease in cash and cash equivalents | -5.3 | -8.3 | | | 5.9 | -5.7 | | |
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Supplemental disclosure of cash flow information: | | | | | | | | |
Cash paid for interest | 0.3 | 0.3 | 0.6 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
Cash paid for income taxes | 0.1 | 0.0 | | | | | | |
Non-cash operating activities: | | | | | | | | |
Lease modification | | | | | 0.9 | | | |
Non-cash investing activities: | | | | | | | | |
Property and equipment in accounts payable | | | 0.1 | | 0.0 | 0.0 | | |