In millions, except per share items | Mar-31-22 | Dec-31-21 | Sep-30-21 | Mar-31-21 | Dec-31-20 | Sep-30-20 | Jun-30-20 | Mar-31-20 |
| 10-Q | 10-K | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q |
ASSETS | | | | | | | | |
Current assets: | | | | | | | | |
Cash and cash equivalents | 13.5 | 11.0 | 17.1 | 26.9 | 35.3 | 43.6 | 10.5 | 18.6 |
Accounts receivable | 0.1 | 0.1 | | | | | | |
Prepaid expenses and other current assets | 2.1 | 0.4 | 1.1 | 1.9 | 0.5 | 0.6 | 0.7 | 0.6 |
Total current assets | 15.6 | 11.6 | 18.1 | 28.5 | 35.7 | 44.2 | 11.2 | 19.2 |
Restricted cash | 0.5 | | | | | | | |
Property and equipment, net | 7.9 | 32.6 | 32.3 | 32.1 | 30.9 | 30.6 | 30.7 | 30.2 |
Operating lease right-of-use assets | 2.4 | 3.8 | 4.1 | 4.7 | 4.9 | 5.2 | 5.3 | 5.5 |
Total assets | 26.4 | 48.4 | 55.0 | 65.7 | 72.0 | 80.5 | 47.7 | 55.3 |
|
LIABILITIES AND STOCKHOLDERS’ EQUITY | | | | | | | | |
Current liabilities: | | | | | | | | |
Accounts payable | 3.7 | 2.1 | 1.6 | 2.7 | 1.9 | 2.0 | 4.8 | 3.3 |
Accrued compensation | 0.5 | 1.8 | 1.9 | 2.7 | 2.3 | 2.0 | 2.8 | 2.6 |
Build-to-suit obligation, current portion, net of debt issuance costs and discount | 1.7 | 3.8 | 4.5 | 4.7 | 4.8 | | | |
Operating lease liabilities, current portion | 1.6 | 1.6 | 1.6 | 1.4 | 1.4 | 1.3 | 1.2 | 1.2 |
Other accrued liabilities | 2.2 | 1.8 | 2.1 | 1.5 | 3.4 | 3.4 | 3.9 | 8.9 |
Total current liabilities | 9.7 | 11.1 | 11.6 | 14.4 | 14.5 | 13.2 | 16.5 | 20.6 |
Build-to-suit obligation, long-term portion, net of debt issuance costs and discount | | 1.0 | 1.4 | 3.4 | 4.4 | 5.4 | 6.5 | 5.1 |
Operating lease liabilities, long-term portion | 2.7 | 3.1 | 3.5 | 4.3 | 4.7 | 5.1 | 5.3 | 5.6 |
Other long-term liabilities | | 0.2 | 0.2 | 0.2 | 0.1 | 0.1 | 0.0 | 0.0 |
Total liabilities | 12.4 | 15.4 | 16.8 | 22.6 | 24.5 | 25.2 | 29.2 | 31.4 |
|
Commitments and contingencies (see note 11) | | | | | | | | |
Stockholders’ equity: | | | | | | | | |
Common stock | | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
Additional paid-in capital | 409.6 | 395.1 | 393.3 | 383.5 | 379.7 | 379.3 | 333.9 | 331.5 |
Accumulated deficit | -395.5 | -362.1 | -355.1 | -340.3 | -332.2 | -324.1 | -315.4 | -307.5 |
Total stockholders’ equity | 14.1 | 33.0 | 38.2 | 43.2 | 47.5 | 55.2 | 18.5 | 24.0 |
Total liabilities and stockholders’ equity | 26.4 | 48.4 | 55.0 | 65.7 | 72.0 | 80.5 | 47.7 | 55.3 |