| Assets | — | — |
| Current assets | — | — |
| Cash and cash equivalents | 174.96a | 127.11a |
| Short-term marketable securities | 657.37a | 907.41a |
| Prepaid expenses and other current assets | 32.11a | 29.63a |
| Total current assets | 864.44a | 1,064.14a |
| Long-term marketable securities | 359.37a | 0a |
| Property and equipment, net | 55.24a | 45.59a |
| Finance lease right-of-use asset | 47.53a | 0a |
| Operating lease right-of-use asset | 22.86a | 26.05a |
| Other non-current assets | 24.74a | 18.14a |
| Total assets | 1,374.18a | 1,153.92a |
| Liabilities and stockholders’ equity | — | — |
| Current liabilities | — | — |
| Accounts payable | 11.14a | 9.48a |
| Accrued expenses and other current liabilities | 91.07a | 68.5a |
| Total current liabilities | 102.21a | 77.98a |
| Operating lease liability, less current portion | 36.67a | 44.98a |
| Finance lease liability, less current portion | 5.62a | 0a |
| Total liabilities | 144.5a | 122.96a |
| Stockholders’ equity | — | — |
| Convertible preferred stock | 0a | 0a |
| Common stock | 1.77a | 1.71a |
| Additional paid-in capital | 2,764.88a | 2,144.81a |
| Accumulated other comprehensive income | 2.02a | 0.64a |
| Accumulated deficit | -1,538.98a | -1,116.21a |
| Total stockholders’ equity | 1,229.68a | 1,030.95a |
| Total liabilities and stockholders’ equity | 1,374.18a | 1,153.92a |