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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | [1]
--- | --- | --- | ---
Current assets: |  |
Cash | $ 39,744 | $ 45,780
Trade and other receivables | 3,783 | 1,468
Prepaid expenses and other current assets | 519 | 378
Total current assets | 44,046 | 47,626
Property and equipment, net | 40 | 59
Operating lease right-of-use assets | 5,929 |
Long-term royalty receivables | 34,375 | 15,000
Long-term equity securities | 873 | 392
Other assets | 832 | 708
Total assets | 86,095 | 63,785
Current liabilities: |  |
Accounts payable | 923 | 1,244
Accrued and other liabilities | 1,100 | 2,382
Contingent consideration under royalty purchase agreements | 75 |
Operating lease liabilities | 2,353 |
Unearned revenue recognized under units-of-revenue method | 859 | 490
Contract liabilities | 798 | 798
Current portion of long-term debt | 3,981 | 789
Total current liabilities | 10,089 | 5,703
Unearned revenue recognized under units-of-revenue method – long-term | 15,876 | 17,017
Long-term debt | 28,698 | 21,690
Long-term operating lease liabilities | 5,189 |
Other liabilities – long-term | 457 | 590
Total liabilities | 60,309 | 45,000
Commitments and Contingencies (Note 11) |  |
Stockholders’ equity: |  |
Convertible preferred stock, $0.05 par value, 1,000,000 shares authorized, 6,256 shares issued and outstanding at September 30, 2019 and December 31, 2018 |  |
Common stock, $0.0075 par value, 277,333,332 shares authorized, 8,752,269 and 8,690,723 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively | 65 | 65
Additional paid-in capital | 1,215,784 | 1,211,122
Accumulated deficit | (1,190,063) | (1,192,402)
Total stockholders’ equity | 25,786 | 18,785
Total liabilities and stockholders’ equity | $ 86,095 | $ 63,785
[1] | The consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.

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