| 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 |
| ASSETS | | | | | | | | |
| Current Assets | | | | | | | | |
| Cash and cash equivalents | 68.8 | 104.9 | 143.4 | 193.4 | 184.2 | 154.8 | 175.9 | 192.6 |
| Restricted cash | | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | |
| Accounts receivable, net | 13.2 | 10.9 | 5.7 | 6.7 | | | | |
| Inventory, net | 7.0 | 6.6 | 4.1 | 6.1 | | | | |
| Prepaid expenses and other current assets | 8.8 | 10.2 | 14.1 | 9.1 | 3.0 | 4.1 | 6.7 | 3.8 |
| Total current assets | 97.7 | 132.7 | 167.4 | 215.3 | 189.7 | 158.9 | 182.6 | 196.4 |
| Property and equipment, net | 2.4 | 2.5 | 2.6 | 2.5 | 2.0 | 1.7 | 1.1 | 0.8 |
| Investment - related party | 0.9 | 0.9 | 0.9 | 0.9 | | | | |
| Other assets | 5.7 | 5.1 | 3.2 | 1.1 | 2.6 | 0.0 | 0.0 | |
| Right-of-use assets, net | 2.5 | 2.7 | 2.7 | 2.9 | 0.7 | 0.8 | 0.9 | 0.7 |
| Total Assets | 109.2 | 143.9 | 176.7 | 222.6 | 195.0 | 161.5 | 184.8 | 197.9 |
| |
| LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT) | | | | | | | | |
| Current Liabilities | | | | | | | | |
| Accounts payable | 4.1 | 4.7 | 2.6 | 6.5 | 3.5 | 2.3 | 7.1 | 2.3 |
| Accrued expenses and other current liabilities | 24.4 | 25.7 | 19.7 | 21.5 | 11.2 | 6.6 | 6.1 | 8.3 |
| Lease liabilities | 0.7 | 0.7 | 0.7 | | | | | |
| Total current liabilities | 29.2 | 31.1 | 23.0 | 28.8 | 15.2 | 9.5 | 13.7 | 11.0 |
| Lease liabilities, non-current | 1.8 | 2.0 | 2.0 | 2.1 | 0.2 | 0.2 | 0.4 | 0.3 |
| Long-term debt, net | 92.2 | 91.4 | 90.6 | 89.8 | 41.9 | | | |
| Other liabilities | 8.2 | 8.6 | 5.1 | 2.3 | 0.2 | | | |
| Total Liabilities | 131.4 | 133.2 | 120.7 | 123.1 | 57.5 | 9.7 | 14.1 | 11.3 |
| |
| Commitments and Contingencies (Note 11) | | | | | | | | |
| Stockholders’ Equity (Deficit) | | | | | | | | |
| Preferred stock, $0.001 par value per share; 5,000,000 shares authorized; 0 outstanding | | | | | | | | |
| Common stock | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Additional paid-in capital | 367.8 | 364.0 | 359.3 | 354.9 | 350.8 | 347.4 | 344.3 | 341.4 |
| Accumulated deficit | -390.0 | -353.2 | -303.3 | -255.4 | -213.3 | -195.7 | -173.7 | -154.8 |
| Total Stockholders’ Equity (Deficit) | -22.2 | 10.8 | 56.0 | 99.5 | 137.5 | 151.8 | 170.6 | 186.7 |
| Total Liabilities and Stockholders’ Equity (Deficit) | 109.2 | 143.9 | 176.7 | 222.6 | 195.0 | 161.5 | 184.8 | 197.9 |