In millions, except per share items | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 |
| 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
Assets | | | | | | | |
Current assets | | | | | | | |
Cash and cash equivalents | 15.5 | 27.9 | 13.1 | 14.6 | 37.0 | 41.0 | 40.2 |
Marketable securities | 120.0 | 64.5 | 28.6 | 52.3 | 56.0 | 107.7 | |
Accounts receivable | 0.5 | | | | | | |
Inventory | 11.0 | | | | | | |
Prepaid expenses and other current assets | 6.4 | 3.9 | 2.2 | 1.8 | 2.1 | 2.3 | 0.3 |
Total current assets | 153.4 | 96.3 | 62.2 | 68.7 | 95.1 | 151.1 | 40.5 |
Property and equipment, net | 0.5 | 0.3 | 0.1 | 0.2 | 0.7 | 0.7 | 0.6 |
Other assets | 1.9 | 2.2 | 1.0 | 1.0 | 1.0 | 1.3 | 0.3 |
Restricted cash | 20.6 | | | | | | |
Total assets | 176.3 | 98.8 | 63.3 | 69.9 | 96.8 | 153.1 | 41.4 |
|
Liabilities and Stockholders' Equity | | | | | | | |
Current liabilities | | | | | | | |
Accounts payable | 4.2 | 3.3 | 2.0 | 1.0 | 1.2 | 0.2 | 0.3 |
Accrued expenses | 11.9 | 7.6 | 19.9 | 4.0 | 5.5 | 4.7 | 4.0 |
Other current liabilities | 0.6 | 0.5 | | 1.7 | 1.7 | 1.7 | |
Total current liabilities | 16.7 | 11.4 | 28.6 | 6.7 | 8.4 | 6.5 | 4.3 |
Deferred royalty obligation | 63.5 | | | | | | |
Long-term liabilities | 4.3 | 1.7 | | | | | |
Total liabilities | 84.6 | 13.1 | 29.1 | 7.4 | 11.0 | 10.3 | 8.9 |
|
Commitments and contingencies (Note 11) | | | | | | | |
Stockholders’ equity: | | | | | | | |
Common stock | 0.6 | 0.4 | 0.2 | 0.2 | 0.2 | 0.2 | |
|
Preferred stock, $0.01 par value; authorized 5,000,000 shares; none outstanding | | | | | | | |
Additional paid-in capital | 438.9 | 358.2 | 270.5 | 267.6 | 264.0 | 260.0 | 9.5 |
|
Accumulated other comprehensive income | | | | | | | |
Accumulated deficit | -347.7 | -272.9 | -236.6 | -205.4 | -178.5 | -117.4 | -81.5 |
Total stockholders’ equity | 91.8 | 85.8 | 34.1 | 62.5 | 85.7 | 142.8 | -72.0 |
Total liabilities and stockholders' equity | 176.3 | 98.8 | 63.3 | 69.9 | 96.8 | 153.1 | 41.4 |