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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 185,710 | $ 165,546
Restricted cash | 930 | 0
Equity securities at fair value | 134,938 | 109,103
Equity securities without readily determinable fair value | 176,010 | 143,257
Investment securities - equity method investments | 31,839 | 30,673
Investment at fair value | 0 | 2,752
Accounts receivable | 12,750 | 506
Prepaid expenses and other current assets | 2,283 | 5,832
Total current assets | 544,460 | 457,669
Long-term restricted cash | 35,422 | 35,000
Patents, net of accumulated amortization | 42,438 | 16,912
Leased right-of-use assets | 759 | 951
Other non-current assets | 4,653 | 4,988
Total assets | 627,732 | 515,520
Current liabilities: |  |
Accounts payable | 2,625 | 1,019
Accrued expenses and other current liabilities | 4,817 | 3,707
Accrued compensation | 2,382 | 2,265
Royalties and contingent legal fees payable | 6,089 | 2,162
Accrued patent investment costs | 10,000 | 0
Senior Secured Notes Payable - short-term | 145,477 | 115,663
Total current liabilities | 171,390 | 124,816
Series A warrant liabilities | 18,464 | 6,640
Series A embedded derivative liabilities | 41,191 | 26,728
Series B warrant liabilities | 230,539 | 52,341
Long-term lease liabilities | 759 | 951
Other long-term liabilities | 5,591 | 591
Total liabilities | 467,934 | 212,067
Commitments and contingencies |  |
Series A redeemable convertible preferred stock, par value $0.001 per share; stated value $100 per share; 350,000 shares authorized, issued and outstanding as of June 30, 2021 and December 31, 2020, respectively; aggregate liquidation preference of $35,000 as of June 30, 2021 and December 31, 2020, respectively | 12,695 | 10,924
Stockholders' equity: |  |
Common stock, par value $0.001 per share; 300,000,000 shares authorized; 49,616,602 and 49,279,453 shares issued and outstanding as of June 30, 2021 and December 31, 2020, respectively | 50 | 49
Treasury stock, at cost, 4,604,365 shares as of June 30, 2021 and December 31, 2020 | (43,270) | (43,270)
Additional paid-in capital | 650,194 | 651,416
Accumulated deficit | (471,819) | (326,708)
Total Acacia Research Corporation stockholders' equity | 135,155 | 281,487
Noncontrolling interests | 11,948 | 11,042
Total stockholders' equity | 147,103 | 292,529
Total liabilities, redeemable convertible preferred stock, and stockholders' equity | $ 627,732 | $ 515,520

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