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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Current assets: |  |
Cash | $ 78,945 | $ 84,222
Restricted cash | 4,840 | 1,611
Short-term equity securities | 2,310 |
Trade and other receivables, net | 12 | 263
Income tax receivable |  | 1,526
Prepaid expenses and other current assets | 1,144 | 443
Total current assets | 87,251 | 88,065
Long-term restricted cash |  | 531
Property and equipment, net | 17 | 21
Operating lease right-of-use assets | 281 | 359
Long-term royalty receivables | 48,075 | 34,575
Long-term equity securities |  | 1,693
Other assets | 128 | 41
Total assets | 135,752 | 125,285
Current liabilities: |  |
Accounts payable | 629 | 456
Accrued and other liabilities | 1,059 | 642
Contingent consideration under royalty purchase agreements | 75 | 75
Operating lease liabilities | 187 | 179
Unearned revenue recognized under units-of-revenue method | 1,503 | 1,452
Contingent liabilities | 1,410 | 1,410
Current portion of long-term debt |  | 8,088
Preferred stock dividend accrual | 1,424 |
Total current liabilities | 6,287 | 12,302
Unearned revenue recognized under units-of-revenue method - long-term | 12,734 | 13,516
Long-term debt |  | 12,764
Long-term operating lease liabilities | 133 | 229
Other liabilities - long-term | 20 | 50
Total liabilities | 19,174 | 38,861
Commitments and Contingencies (Note 10) |  |
Stockholders' equity: |  |
Common stock, $0.0075 par value, 277,333,332 shares authorized, 11,310,001 and 11,228,792 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively | 85 | 84
Additional paid-in capital | 1,307,140 | 1,267,377
Accumulated deficit | (1,190,696) | (1,181,086)
Total stockholders' equity | 116,578 | 86,424
Total liabilities and stockholders' equity | 135,752 | 125,285
8.625% Series A Cumulative, Perpetual Preferred Stock |  |
Stockholders' equity: |  |
Preferred Stock | 49 | 49
8.375% Series B Cumulative, Perpetual Preferred Stock |  |
Stockholders' equity: |  |
Preferred Stock |  |
Convertible preferred stock. |  |
Stockholders' equity: |  |
Preferred Stock |  |

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