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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | [1]
--- | --- | --- | ---
Current assets: |  |
Cash | $ 49,491 | $ 56,688
Trade and other receivables, net | 411 | 2,933
Income tax receivable | 1,526 |
Prepaid expenses and other current assets | 849 | 352
Total current assets | 52,277 | 59,973
Property and equipment, net | 22 | 34
Operating lease right-of-use assets | 436 | 510
Long-term royalty receivables | 34,375 | 34,375
Equity securities | 531 | 681
Other assets | 215 | 151
Total assets | 87,856 | 95,724
Current liabilities: |  |
Accounts payable | 646 | 614
Accrued and other liabilities | 605 | 945
Contingent consideration under royalty purchase agreements | 75 | 75
Operating lease liabilities | 171 | 163
Unearned revenue recognized under units-of-revenue method | 1,393 | 1,096
Contract liabilities | 798 | 798
Current portion of long-term debt | 7,596 | 5,184
Total current liabilities | 11,284 | 8,875
Unearned revenue recognized under units-of-revenue method - long-term | 14,325 | 15,317
Long-term debt | 23,497 | 27,093
Long-term operating lease liabilities | 320 | 408
Other liabilities - long-term | 35 | 43
Total liabilities | 49,461 | 51,736
Commitments and Contingencies (Note 10) |  |
Stockholders' equity: |  |
Convertible preferred stock, $0.05 par value, 1,000,000 shares authorized, 5,003 and 6,256 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively |  |
Common stock, $0.0075 par value, 277,333,332 shares authorized, 11,018,143 and 9,758,583 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively | 83 | 73
Additional paid-in capital | 1,240,987 | 1,238,299
Accumulated deficit | (1,202,675) | (1,194,384)
Total stockholders' equity | 38,395 | 43,988
Total liabilities and stockholders' equity | $ 87,856 | $ 95,724
[1] | The consolidated balance sheet as of December 31, 2019 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, 2019.

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