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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 136,225 | $ 153,290
Short-term restricted cash | 160 | 160
Short-term equity securities | 413 | 161
Trade and other receivables, net | 3 | 1,004
Short-term royalty and commercial payment receivables | 9,819 | 14,215
Prepaid expenses and other current assets | 270 | 483
Total current assets | 146,890 | 169,313
Long-term restricted cash | 6,016 | 6,100
Property and equipment, net | 40 | 25
Operating lease right-of-use assets | 364 | 378
Long-term royalty and commercial payment receivables | 65,577 | 57,952
Other assets - long term | 533 | 533
Total assets | 219,420 | 234,301
Current liabilities: |  |
Accounts payable | 1,515 | 653
Accrued and other liabilities | 1,299 | 2,768
Contingent consideration under RPAs, AAAs and CPPAs | 3,000 | 7,000
Operating lease liabilities | 55 | 54
Unearned revenue recognized under units-of-revenue method | 2,159 | 2,113
Preferred stock dividend accrual | 1,368 | 1,368
Current portion of long-term debt | 6,144 | 5,543
Total current liabilities | 15,540 | 19,499
Unearned revenue recognized under units-of-revenue method - long-term | 6,692 | 7,228
Long-term operating lease liabilities | 319 | 335
Long-term debt | 114,528 | 118,518
Total liabilities | 137,079 | 145,580
Commitments and Contingencies (Note 10) |  |
Stockholders' equity: |  |
Common stock, $0.0075 par value, 277,333,332 shares authorized, 11,636,355 and 11,495,492 shares issued and outstanding at March 31, 2024 and December 31, 2023, respectively | 87 | 86
Additional paid-in capital | 1,314,036 | 1,311,809
Accumulated deficit | (1,231,831) | (1,223,223)
Total stockholders' equity | 82,341 | 88,721
Total liabilities and stockholders' equity | 219,420 | 234,301
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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