| In millions, except per share items | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 |
| | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Cash flows from operating activities | | | | | | | | |
| Net loss | -36.7 | -49.9 | -47.9 | -42.1 | -17.7 | -22.0 | -18.9 | -22.2 |
| |
| Adjustments to reconcile net loss to net cash used in operating activities: | | | | | | | | |
| Stock-based compensation expense | 3.8 | 4.2 | 4.4 | 3.1 | 3.1 | 3.0 | 2.7 | 2.2 |
| Depreciation | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 |
| Amortization and accretion of long-term debt related costs | 1.1 | 1.0 | 1.0 | 0.9 | 0.5 | | | |
| Reduction in the carrying amount of the right-of-use assets | 0.2 | 0.3 | 0.3 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 |
| Provision for inventory obsolescence | 0.0 | -0.1 | | | | | | |
| Non-cash consideration for license revenue - related party | | | | | -0.4 | | | |
| Change in fair value of net embedded derivative liability | -0.4 | 3.5 | 2.7 | | -0.2 | | | |
| Changes in assets and liabilities: | | | | | | | | |
| Accounts receivable, net | -2.3 | -5.2 | 0.9 | -6.7 | | | | |
| Inventory | -0.9 | -4.3 | -0.4 | -7.0 | | | | |
| Prepaid expenses and other current assets | 1.5 | 3.9 | -5.0 | -6.1 | 0.7 | 2.7 | -2.9 | -2.6 |
| Other receivable - related party | | | | 2.5 | -2.5 | | | |
| Other assets | 0.0 | -0.1 | 0.0 | 0.0 | -0.1 | | 0.0 | |
| Accounts payable | -0.6 | 2.2 | -3.9 | 2.7 | 1.2 | -4.8 | 4.8 | 0.0 |
| Lease liabilities - operating leases | -0.7 | | | | -0.4 | | | |
| Accrued expenses and other current liabilities | -1.4 | 5.9 | -1.7 | 10.1 | 4.6 | 0.5 | -2.2 | 1.5 |
| Other liabilities | | | 0.0 | | | | | |
| Net cash used in operating activities | -36.0 | -38.8 | -49.7 | -41.5 | -10.8 | -20.6 | -16.5 | -21.1 |
| |
| Cash flows from investing activities | | | | | | | | |
| Purchases of property and equipment | | -0.1 | -0.1 | -0.2 | -0.3 | -0.7 | -0.3 | -0.4 |
| Net cash used in investing activities | | -0.1 | -0.1 | -0.2 | -0.3 | -0.7 | -0.3 | -0.4 |
| |
| Cash flows from financing activities | | | | | | | | |
| Payment of deferred offering costs | | | | 0.0 | 0.0 | | 0.0 | -0.4 |
| Net proceeds from long-term debt | | | | | 40.2 | | | |
| Repayment of long-term debt | -0.1 | -0.1 | -0.2 | | | | | |
| Repayment of principal on finance leases | 0.0 | | | | 0.0 | | | |
| Payment of withholding taxes related to stock-based compensation | | | -0.1 | | | | | |
| Proceeds from the issuance of common stock under the ESPP | 0.0 | 0.5 | | | | | | |
| Proceeds from the exercise of stock options | 0.0 | 0.5 | 0.1 | 1.0 | 0.3 | 0.1 | 0.2 | 0.0 |
| Net cash provided by financing activities | -0.2 | 0.5 | -0.2 | 50.9 | 40.4 | 0.1 | 0.2 | -0.3 |
| Net decrease in cash, cash equivalents and restricted cash | -36.1 | -38.5 | -50.0 | | 29.4 | -21.1 | -16.7 | |
| |
| Reconciliation of cash, cash equivalents and restricted cash | | | | | | | | |
| Cash and cash equivalents | | | | | | | | |
| |
| Cash paid during the period for: | | | | | | | | |
| Interest | 2.4 | 2.1 | 2.1 | 1.7 | 0.6 | | | |
| Non-cash investing and financing activities: | | | | | | | | |
| Right-of-use assets acquired through leases | | 0.2 | 0.1 | 2.4 | | | 0.3 | |