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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 193,161 | $ 221,804
Short-term investments | 134,287 | 89,475
Accounts receivable | 45,351 | 9,843
Prepaid expenses and other current assets | 5,101 | 3,441
Total current assets | 377,900 | 324,563
Property and equipment, net of accumulated depreciation | 536 | 339
Patents, net of accumulated amortization | 305,809 | 313,529
Goodwill | 30,149 | 30,149
Other assets | 138 | 137
Total assets | 714,532 | 668,717
Current liabilities: |  |
Accounts payable and accrued expenses / costs | 17,127 | 9,485
Royalties and contingent legal fees payable | 36,736 | 12,508
Total current liabilities | 53,863 | 21,993
Deferred income taxes | 27,831 | 27,831
Other liabilities | 494 | 415
Total liabilities | 82,188 | 50,239
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; 49,211,829 and 49,160,844 shares issued and outstanding as of March 31, 2013 and December 31, 2012, respectively | 49 | 49
Treasury stock, at cost, 1,129,408 shares as of March 31, 2013 and December 31, 2012 | (26,731) | (26,731)
Additional paid-in capital | 650,966 | 644,982
Accumulated comprehensive income (loss) | (317) | (1,166)
Accumulated deficit | (519) | (5,632)
Total Acacia Research Corporation stockholders' equity | 623,448 | 611,502
Noncontrolling interests in operating subsidiaries | 8,896 | 6,976
Total stockholders' equity | 632,344 | 618,478
Total liabilities and stockholders' equity | $ 714,532 | $ 668,717

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