| 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 | -57.8 | -61.5 | -84.0 | -76.0 | -58.9 | -68.3 | -38.6 | -50.4 |
| Adjustments to reconcile net loss to cash used in operating activities: | | | | | | | | |
| Depreciation & amortization | 8.3 | 7.3 | 5.8 | | 5.4 | 4.4 | 3.6 | 3.2 |
| Amortization of deferred financing fees and debt discount | 0.5 | 0.5 | 0.5 | | 0.6 | 0.8 | 1.5 | 3.0 |
| Bad debt expense | | -0.1 | 0.5 | | 0.2 | | | |
| Stock-based compensation expense | 9.8 | 11.0 | 14.8 | | 19.1 | 17.9 | 13.4 | 12.0 |
| Change in fair value of warrant liabilities and derivatives | -1.7 | -6.4 | -1.9 | | -43.1 | -33.2 | -38.3 | -22.2 |
| Changes in operating assets and liabilities: | | | | | | | | |
| Accounts receivable | 12.6 | 12.6 | 24.1 | | -0.6 | -1.1 | -10.7 | -5.7 |
| Inventory | 52.4 | 35.9 | 3.1 | | -63.3 | -82.9 | -78.3 | -67.7 |
| Prepaid expenses and other current assets | 1.4 | 3.0 | -0.4 | | 0.2 | -1.1 | 0.0 | -3.2 |
| Other noncurrent assets | -0.2 | -0.1 | 0.2 | | 0.0 | | | -0.7 |
| Accounts payable and accrued expenses | -28.7 | -16.4 | -23.4 | | -2.3 | -13.5 | -13.0 | -16.2 |
| Deferred revenue | -2.5 | 1.8 | 2.3 | | 3.8 | 4.4 | 6.2 | 9.6 |
| Operating lease liabilities | -2.7 | -2.5 | -6.1 | | -5.3 | | | |
| Other liabilities | 0.4 | -0.2 | -6.4 | | -0.7 | -12.6 | -9.0 | -0.8 |
| Net cash used in operating activities | 2.9 | -3.8 | -48.8 | -92.4 | -127.9 | -172.3 | -157.4 | -136.1 |
| |
| CASH FLOWS FROM INVESTING ACTIVITIES: | | | | | | | | |
| Capital expenditures | -10.2 | -11.9 | -13.0 | | -25.9 | -21.2 | -22.4 | -15.8 |
| Net cash used in investing activities | -10.0 | -11.8 | -13.0 | | -17.6 | -21.2 | -18.4 | -13.0 |
| |
| CASH FLOWS FROM FINANCING ACTIVITIES: | | | | | | | | |
| Payment of finance lease obligations | -2.1 | -2.2 | -2.3 | | -0.7 | | | |
| Proceeds from the exercise of stock options | 0.5 | 0.3 | 0.7 | | 3.3 | 3.3 | 3.3 | 2.0 |
| Proceeds from issuance of common stock under ESPP | 0.4 | | 0.1 | | | | | |
| Tax payments related to the issuance of common stock | -1.4 | -0.9 | -0.9 | | | -0.2 | | |
| Net cash provided by financing activities | -2.9 | -2.7 | -2.4 | | 1.7 | 355.5 | 354.3 | 402.4 |
| Effect of exchange rate changes on cash | -0.1 | -0.1 | 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 | -2.1 | -0.5 | -0.4 | | 0.5 | 0.3 | 2.2 | 1.7 |
| Cash paid for interest | 0.2 | 0.2 | 0.3 | | 0.2 | 0.9 | 1.3 | 4.1 |
| NON-CASH INVESTING AND FINANCING ACTIVITIES: | | | | | | | | |
| Establishment of operating lease | | | | | 24.6 | | | |