In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 |
| 10-Q | 10-Q | | 10-Q | 10-Q | |
Assets | | | | | | |
Current assets: | | | | | | |
Cash and cash equivalents | 158.4 | 260.5 | | 314.6 | 111.3 | |
Marketable securities | 85.7 | | | | | |
Prepaid expenses and other current assets | 9.0 | 9.3 | | 4.9 | 0.5 | |
Total current assets | 253.0 | 269.9 | | 319.5 | 111.7 | |
Property and equipment, net | 13.1 | 10.5 | | | | |
Operating lease right-of-use assets | 18.7 | 19.0 | | 20.1 | 0.2 | |
Restricted cash | 1.6 | 1.6 | | 1.6 | | |
Other assets | 0.0 | 0.0 | | 0.0 | 2.8 | |
Total assets | 286.5 | 301.0 | | 341.2 | 114.7 | |
|
Liabilities and Stockholders' Equity | | | | | | |
Current liabilities: | | | | | | |
Accounts payable (includes related party amounts of $0 and $141, respectively) | 0.2 | 1.7 | | 6.0 | 4.0 | |
Accrued expenses (includes related party amounts of $12 and $140, respectively) | 17.6 | 17.4 | | 6.4 | 4.8 | |
Accrued interest | 0.1 | 0.1 | | 0.0 | 4.9 | |
Current portion of operating lease liability | 0.4 | 0.0 | | 0.0 | 0.0 | |
Total current liabilities | 18.3 | 19.3 | | 12.5 | 282.9 | |
Operating lease liability, net of current portion | 23.7 | 23.0 | | 20.8 | 0.1 | |
Long-term debt, net of debt discount | 24.8 | 14.9 | | 4.7 | | |
Other long-term liabilities | 0.9 | 0.7 | | 0.1 | 0.0 | |
Total liabilities | 67.8 | 57.9 | | 38.1 | 283.1 | |
|
Commitments and contingencies (Note 8) | | | | | | |
Stockholders' equity: | | | | | | |
Preferred stock, $0.0001 par value; authorized shares-50,000,000 at June 30, 2023 and December 31, 2022; no shares issued and outstanding at June 30, 2023 and December 31, 2022 | | | | | | |
Common stock, $0.0001 par value; authorized shares | 0.0 | 0.0 | | 0.0 | 0.0 | |
Additional paid-in capital | 538.9 | 535.2 | | 530.2 | 4.7 | |
Accumulated other comprehensive loss | -0.3 | -0.3 | | | | |
Accumulated deficit | -319.8 | -291.9 | | -227.0 | -173.1 | |
Total stockholders' equity | 218.8 | 243.1 | | 303.2 | -168.4 | |
Total liabilities and stockholders' equity | 286.5 | 301.0 | | 341.2 | 114.7 | |