| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 |
| | 10-K | 10-K | 10-K | 10-K | S-1/A |
| Assets | | | | | |
| Current assets: | | | | | |
| Cash and cash equivalents | 587.4 | 663.6 | 424.2 | 65.1 | |
| Restricted cash | 1.0 | 16.6 | | | |
| Accounts receivable, net | 85.3 | 51.2 | 33.4 | 28.1 | |
| Inventory | 60.0 | 30.0 | 15.3 | 8.6 | |
| Prepaid expenses and other current assets | 13.9 | 13.0 | 8.0 | 4.5 | |
| Total current assets | 747.6 | 774.4 | 480.8 | 106.2 | |
| Property and equipment, net | 169.5 | 72.8 | 48.8 | 11.1 | |
| Restricted cash | 7.6 | 8.5 | | | |
| Operating lease right-of-use assets | 60.9 | 47.0 | | | |
| Goodwill | 4.5 | | | | |
| Intangible assets, net | 25.4 | 22.4 | | | |
| Other noncurrent assets | 3.3 | 4.3 | 23.9 | 1.9 | |
| Total assets | 1,018.8 | 929.3 | 605.9 | 124.3 | |
| |
| Liabilities and stockholders’ equity | | | | | |
| Current liabilities: | | | | | |
| Accounts payable | 17.4 | 4.7 | 13.0 | 8.8 | |
| Accrued compensation and related benefits | 31.6 | 15.4 | 12.4 | 7.0 | |
| Accrued expenses and other current liabilities | 50.9 | 64.6 | 24.4 | 11.3 | |
| Deferred revenue | 5.3 | 4.5 | | | |
| Total current liabilities | 110.4 | 118.1 | 63.0 | 32.4 | |
| Operating lease liabilities, noncurrent | 76.8 | 57.0 | | | |
| Other noncurrent liabilities | 8.2 | 3.9 | 1.9 | 0.8 | |
| Total liabilities | 201.3 | 190.3 | 185.8 | 101.1 | |
| |
| Commitments and contingencies (Note 4) | | | | | |
| Stockholders’ equity: | | | | | |
| Preferred stock | | | | 243.2 | |
| Common stock | 0.0 | 0.0 | 0.0 | 0.0 | |
| Additional paid-in capital | 1,680.9 | 1,544.2 | 682.5 | 11.2 | |
| Accumulated deficit | -863.3 | -805.1 | -262.4 | -231.1 | |
| Accumulated other comprehensive loss | 0.0 | -0.1 | 0.0 | 0.0 | |
| Total stockholders’ equity | 817.6 | 739.1 | 420.1 | -220.0 | |
| Total liabilities and stockholders’ equity | 1,018.8 | 929.3 | 605.9 | 124.3 | |