In millions, except per share items | Jun-30-21 | Mar-31-21 | Dec-31-20 | Sep-30-20 | Jun-30-20 | Mar-31-20 | Dec-31-19 | Sep-30-19 |
| 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
Cash flows from operating activities: | | | | | | | | |
Net loss | -13.2 | -11.8 | -11.9 | -3.2 | -17.3 | -12.7 | -9.0 | -13.8 |
Adjustments to reconcile net loss income to net cash used in operating activities: | | | | | | | | |
Stock-based compensation | 2.1 | 2.3 | 1.8 | 2.1 | 1.8 | 1.8 | 1.5 | 2.2 |
Amortization of intangible asset | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 |
Change in fair value of warrant liability | -0.7 | 0.8 | 1.0 | -6.9 | 7.4 | -0.6 | -1.3 | -3.2 |
Amortization of debt discounts and debt issuance costs | 0.3 | 0.3 | 0.3 | 0.4 | | | | |
Accretion of discounts on marketable securities | | | | | 0.0 | 0.0 | -0.1 | -0.2 |
Depreciation | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
Changes in operating assets and liabilities: | | | | | | | | |
Accounts receivable | -0.7 | 0.0 | 0.1 | 0.0 | -0.2 | -0.4 | 1.1 | 3.0 |
Inventory | 0.3 | -0.9 | 0.6 | 0.2 | 0.2 | 0.1 | 0.4 | 0.8 |
Prepaid expenses and other current assets | 0.2 | -1.0 | 0.5 | 0.5 | -0.8 | 0.1 | 0.9 | 0.4 |
Other assets | 0.1 | 0.1 | -0.2 | -0.1 | 0.0 | 0.3 | 0.2 | 0.2 |
Accounts payable | -5.1 | 4.3 | -0.1 | -0.4 | -3.3 | 2.0 | 1.4 | 0.5 |
Accrued and other liabilities | 5.7 | -8.6 | 1.7 | 0.4 | -1.2 | -6.9 | 2.1 | 2.2 |
Net cash used in operating activities | -9.8 | -13.4 | -5.0 | -5.8 | -12.1 | -15.2 | -1.6 | -6.7 |
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Cash flows from investing activities: | | | | | | | | |
Sales and maturities of marketable securities | | | | | 6.3 | 14.8 | | |
Purchases of property and equipment | | 0.0 | | 0.0 | | | 0.0 | 0.0 |
Net cash (used in) provided by investing activities | | 0.0 | | 0.0 | 6.3 | 14.8 | 19.6 | -12.4 |
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Cash flows from financing activities: | | | | | | | | |
Payments related to tax withholding for net-share settled equity awards | -0.3 | -0.4 | | -0.1 | -0.3 | -0.1 | | 0.0 |
Proceeds from long-term debt, net | | | 10.0 | -0.1 | 9.5 | | | |
Proceeds from exercise of stock options | | 0.1 | | | | | | 0.0 |
Proceed from issuance of ordinary shares in connection with at-the-market offering, net | | 0.0 | | | | | | |
Net cash (used in) provided by financing activities | -0.3 | -0.2 | 10.7 | 27.7 | 9.2 | -0.1 | | 0.0 |
Net (decrease) increase in cash and cash equivalents | -23.7 | | | | 2.9 | | | |
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Supplemental disclosures of cash flow information: Cash paid during the year for: | | | | | | | | |
Interest | 0.5 | 0.5 | 0.3 | 0.3 | 0.1 | | | |
Income taxes other, net of refunds | | 1.3 | 0.0 | 0.2 | 0.5 | | | |