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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 128,809 $ 136,604
Debt Securities, Trading 33,642 0
Trading Securities, Equity 3,012 0
Accounts receivable 32,884 153
Prepaid expenses and other current assets 3,125 2,938
Total current assets 201,472 139,695
Investments at fair value 7,459 104,754
Equity Method Investments 8,195 2,195
Patents, net of accumulated amortization 6,587 61,917
Other assets 236 207
Total assets 223,949 308,768
Current liabilities:    
Accounts payable and accrued expenses 8,347 7,956
Royalties and contingent legal fees payable 22,688 1,601
Total current liabilities 31,035 9,557
Other liabilities 1,674 3,552
Total liabilities 32,709 13,109
Commitments and contingencies (Note 10)
Stockholders' equity:    
Preferred stock, par value $0.001 per share; 10,000,000 shares authorized; no shares issued or outstanding 0 0
Common stock, par value $0.001 per share; 100,000,000 shares authorized; 49,639,319 shares issued and outstanding as of December 31, 2018 and 50,639,926 shares issued and outstanding as of December 31, 2017 50 51
Treasury stock, at cost, 2,919,828 and 1,729,408 shares as of December 31, 2018 and 2017 (39,272) (34,640)
Additional paid-in capital 651,156 648,996
Accumulated comprehensive loss 0 (88)
Accumulated deficit (422,541) (320,018)
Total Acacia Research Corporation stockholders’ equity 189,393 294,301
Noncontrolling interests in operating subsidiaries 1,847 1,358
Total stockholders’ equity 191,240 295,659
Total liabilities and stockholders' equity $ 223,949 $ 308,768