| 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-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| CASH FLOWS FROM OPERATING ACTIVITIES: | | | | | | | | |
| Net loss | -11.7 | -14.2 | -21.3 | -10.6 | -15.4 | -36.7 | -13.2 | 6.5 |
| Adjustments to reconcile net loss to cash used in operating activities: | | | | | | | | |
| Depreciation & amortization | 2.9 | 2.9 | 2.5 | | 1.9 | 1.5 | 1.1 | 1.0 |
| Amortization of right-of-use assets | 1.1 | | | | 1.4 | | | |
| Amortization of deferred financing fees and debt discount | 0.2 | 0.2 | 0.2 | | 0.2 | 0.2 | 0.1 | 0.2 |
| Bad debt expense | | -0.6 | 0.2 | | 0.2 | | | |
| Stock-based compensation expense | 3.2 | 2.9 | 3.7 | | 4.3 | 6.8 | 4.2 | 3.7 |
| Provision for inventory obsolescence reserve | 0.6 | | | | 0.3 | | | |
| Change in fair value of warrant liabilities and derivatives | -1.3 | 1.2 | -1.6 | | -6.0 | 5.7 | -14.5 | -28.3 |
| Changes in operating assets and liabilities: | | | | | | | | |
| Accounts receivable | 1.4 | -1.3 | 12.5 | | 1.4 | 10.2 | -9.3 | -2.8 |
| Inventory | 11.3 | 23.2 | 17.9 | | -5.2 | -9.6 | -20.4 | -28.0 |
| Prepaid expenses and other current assets | -1.6 | 2.8 | 0.3 | | -0.1 | -0.6 | 1.8 | -0.9 |
| Other noncurrent assets | -0.1 | -0.3 | 0.2 | | 0.0 | | | 0.0 |
| Accounts payable and accrued expenses | -14.8 | 5.8 | -19.7 | | -2.5 | -1.2 | 3.0 | -1.6 |
| Deferred revenue | -1.4 | -5.1 | 4.0 | | 2.9 | -4.7 | 7.8 | -2.3 |
| Operating lease liabilities | -0.9 | -1.0 | -0.8 | | -0.7 | -4.5 | | |
| Other liabilities | 0.5 | 2.3 | -2.4 | | -0.1 | -3.9 | -2.7 | 6.0 |
| Net cash used in operating activities | -10.7 | 19.2 | 5.1 | -10.6 | -17.4 | -25.8 | -38.5 | -46.1 |
| |
| CASH FLOWS FROM INVESTING ACTIVITIES: | | | | | | | | |
| Capital expenditures | -3.0 | -2.5 | -4.7 | | -4.7 | -3.6 | -6.6 | -11.0 |
| Net cash used in investing activities | -3.0 | -2.3 | -4.7 | | -4.7 | -3.6 | -6.6 | -2.7 |
| |
| CASH FLOWS FROM FINANCING ACTIVITIES: | | | | | | | | |
| Payment of finance lease obligations | -0.1 | 0.0 | -2.0 | | -0.2 | -0.2 | -0.1 | -0.3 |
| Proceeds from the exercise of stock options | 0.4 | 0.0 | 0.1 | | 0.2 | 0.5 | 1.7 | 0.9 |
| Proceeds from issuance of common stock under ESPP | 0.3 | | 0.1 | | | | | |
| Tax payments related to the issuance of common stock | -0.5 | -0.3 | -0.6 | | | -0.2 | | |
| Net cash provided by financing activities | -0.2 | -0.2 | -2.4 | | 0.0 | 0.1 | 1.2 | 0.4 |
| Effect of exchange rate changes on cash | 0.0 | 0.0 | 0.0 | | 0.0 | | | 0.0 |
| NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH | -13.9 | | | | -22.2 | | | |
| |
| RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH: | | | | | | | | |
| Cash and cash equivalents | | | | | | | | |
| Restricted cash - Other noncurrent assets | | | | | | | | |
| |
| SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION: | | | | | | | | |
| Purchases of property and equipment included in accounts payable and accrued liabilities | 0.1 | -0.2 | -2.0 | | 1.7 | -0.1 | 0.3 | -1.4 |
| Cash paid for interest | 0.0 | 0.0 | 0.1 | | 0.1 | 0.1 | 0.1 | 0.0 |
| NON-CASH INVESTING AND FINANCING ACTIVITIES: | | | | | | | | |
| Establishment of operating lease | | | | | 24.6 | | | |