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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 296,866 | $ 314,733
Short-term investments | 132,496 | 6,597
Accounts receivable | 10,822 | 2,915
Prepaid expenses and other current assets | 1,786 | 803
Total current assets | 441,970 | 325,048
Property and equipment, net of accumulated depreciation | 342 | 220
Patents, net of accumulated amortization | 214,204 | 25,188
Goodwill | 36,217 | 0
Investments - noncurrent | 1,506 | 1,956
Other assets | 462 | 465
Total assets | 694,701 | 352,877
Current liabilities: |  |
Accounts payable and accrued expenses / costs | 18,648 | 6,625
Royalties and contingent legal fees payable | 19,103 | 23,508
Total current liabilities | 37,751 | 30,133
Deferred income taxes | 32,592 | 0
Other liabilities | 654 | 632
Total liabilities | 70,997 | 30,765
Commitments and contingencies (Note 5) |  |
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; 49,714,283 and 42,928,001 shares issued and outstanding as of June 30, 2012 and December 31, 2011, respectively | 50 | 43
Additional paid-in capital | 627,825 | 386,821
Accumulated comprehensive income (loss) | 797 | (1,830)
Accumulated deficit | (8,836) | (65,085)
Total Acacia Research Corporation stockholders' equity | 619,836 | 319,949
Noncontrolling interests in operating subsidiaries | 3,868 | 2,163
Total stockholders' equity | 623,704 | 322,112
Total liabilities and stockholders' equity | $ 694,701 | $ 352,877

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