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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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