| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Assets | | | | | | | | |
| Current assets: | | | | | | | | |
| Cash and cash equivalents | 90.5 | 149.8 | 228.7 | 147.4 | 104.6 | 70.2 | 187.3 | 49.8 |
| Inventory | 21.8 | 38.2 | 61.0 | 116.3 | 114.2 | | | |
| Accounts receivable, net | 39.2 | 50.9 | 26.9 | 38.9 | 16.7 | 34.2 | 33.8 | |
| Prepaid expenses and other current assets | 33.5 | 33.1 | 14.9 | 6.6 | 15.7 | 6.3 | 2.2 | 2.6 |
| Total current assets | 184.9 | 272.0 | 371.4 | 309.5 | 468.3 | 358.4 | 296.3 | 141.0 |
| Property and equipment, net | 5.2 | 6.8 | 8.6 | 10.4 | 8.0 | 3.6 | 2.6 | 0.5 |
| Operating lease assets | 29.2 | 33.9 | 26.9 | 29.0 | | | | |
| Goodwill | 55.1 | 55.1 | 55.1 | 55.1 | 55.1 | | | |
| |
| Other intangible assets, net | | | | | | | | |
| Other assets | 5.4 | 49.8 | 38.0 | 76.0 | 137.0 | 2.3 | 1.3 | 1.3 |
| Total assets | 351.8 | 525.6 | 644.1 | 771.2 | 996.5 | 364.2 | 300.2 | 142.9 |
| |
| Liabilities and stockholders' equity | | | | | | | | |
| Current liabilities: | | | | | | | | |
| Accounts payable | 18.0 | 33.6 | 41.3 | 39.2 | 42.8 | 7.0 | 2.0 | 2.3 |
| Accrued expenses and other current liabilities | 71.0 | 104.5 | 130.6 | 129.1 | 150.9 | 52.4 | 30.3 | 9.6 |
| Short-term deferred revenue | 3.7 | 20.9 | 15.2 | 39.8 | 57.0 | 81.7 | | |
| Current portion of long-term debt | 32.0 | 97.5 | | | 15.0 | | | |
| Total current liabilities | 124.8 | 256.5 | 187.1 | 208.1 | 265.7 | 141.1 | 114.3 | 11.9 |
| Deferred revenue, net of current portion | 43.3 | 21.5 | 25.3 | 33.1 | 55.7 | 98.0 | | |
| Operating lease liabilities, net of current portion | 29.0 | 33.7 | 24.6 | 27.5 | | | | |
| Derivative liability | 0.8 | 1.8 | 2.4 | 1.7 | | | | |
| Long-term debt, net | 34.1 | | 96.4 | 75.8 | | | | |
| Refund liability to customer | 41.0 | | | | | | | |
| Other non-current liabilities | 12.2 | 82.5 | 60.6 | 30.2 | 29.6 | 0.0 | 0.0 | 0.0 |
| Total liabilities | 342.5 | 449.1 | 396.5 | 376.4 | 360.6 | 241.7 | 232.1 | 11.9 |
| |
| Commitments and contingencies (Note 12) | | | | | | | | |
| Stockholders' (deficit) equity: | | | | | | | | |
| Preferred stock $0.00001 par value, 25,000,000 shares authorized; 0 shares issued and outstanding at March 31, 2023 and December 31, 2022 | | | | | | | | |
| Common stock $0.00001 par value; 350 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | | | |
| Additional paid-in capital | 1,562.2 | 1,536.8 | 1,425.1 | 1,188.8 | 1,150.6 | 493.8 | 365.3 | 292.8 |
| Accumulated other comprehensive gain | 0.0 | 0.0 | 0.0 | | -0.3 | -0.4 | 0.0 | -0.2 |
| Accumulated deficit | -1,552.9 | -1,460.4 | -1,177.5 | -794.1 | -514.4 | -370.8 | -297.1 | -161.4 |
| Total stockholders' (deficit) equity | 9.3 | 76.5 | 247.6 | 394.8 | 635.9 | 122.6 | 68.1 | 131.0 |
| Total liabilities and stockholders' (deficit) equity | 351.8 | 525.6 | 644.1 | 771.2 | 996.5 | 364.2 | 300.2 | 142.9 |