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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 45,780 | $ 43,471
Trade and other receivables | 1,468 | 397
Prepaid expenses and other current assets | 378 | 327
Total current assets | 47,626 | 44,195
Property and equipment, net | 59 | 83
Long-term royalty receivables | 15,000 |
Long-term equity securities | 392 |
Other assets | 708 | 657
Total assets | 63,785 | 44,935
Current liabilities: |  |
Accounts payable | 1,244 | 1,679
Accrued and other liabilities | 2,382 | 2,693
Income taxes payable |  | 1,637
Unearned revenue recognized under units-of-revenue method | 490 | 615
Contract liabilities | 798 | 798
Current portion of long-term debt | 789 |
Total current liabilities | 5,703 | 7,422
Unearned revenue recognized under units-of-revenue method – long-term | 17,017 | 17,123
Long-term debt | 21,690 | 14,572
Other liabilities – long-term | 590 | 32
Total liabilities | 45,000 | 39,149
Commitments and Contingencies (Note 14) |  |
Stockholders’ equity: |  |
Convertible preferred stock, $0.05 par value, 1,000,000 shares authorized, 6,256 and 5,003 shares issued and outstanding at December 31, 2018 and 2017, respectively |  |
Common stock, $0.0075 par value, 277,333,332 shares authorized, 8,690,723 and 8,249,158 shares issued and outstanding at December 31, 2018 and 2017, respectively | 65 | 62
Additional paid-in capital | 1,211,122 | 1,184,783
Accumulated deficit | (1,192,402) | (1,179,059)
Total stockholders’ equity | 18,785 | 5,786
Total liabilities and stockholders’ equity | $ 63,785 | $ 44,935

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