CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 289,369	$ 308,943
Equity securities at fair value	246,484	361,778
Equity securities without readily determinable fair value	5,816	5,816
Investment securities - equity method investments	30,934	30,934
Accounts receivable, net	9,141	9,517
Inventories, net	10,014	8,930
Prepaid expenses and other current assets	4,961	4,764
Total current assets	596,719	730,682
Long-term restricted cash	0	418
Property, plant and equipment, net	3,885	4,183
Goodwill	7,470	7,470
Other intangible assets, net	45,759	48,793
Leased right-of-use assets	2,334	2,027
Other non-current assets	5,273	5,283
Total assets	661,440	798,856
Current liabilities:
Accounts payable	5,298	5,440
Accrued expenses and other current liabilities	7,349	6,227
Accrued compensation	4,345	3,698
Royalties and contingent legal fees payable	2,303	2,463
Accrued patent investment costs	5,000	0
Deferred revenue	1,453	1,114
Senior Secured Notes Payable	168,661	181,248
Total current liabilities	194,409	200,190
Deferred revenue, net of current portion	660	581
Series A warrant liabilities	10,395	11,291
Series A embedded derivative liabilities	14,506	18,448
Series B warrant liabilities	73,118	96,378
Long-term lease liabilities	2,298	2,027
Deferred income tax liabilities, net	3,513	18,552
Other long-term liabilities	1,165	6,161
Total liabilities	300,064	353,628
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 March 31, 2022 and December 31, 2021; aggregate liquidation preference of $35,000 as of March 31, 2022 and December 31, 2021	15,904	14,753
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; 300,000,000 shares authorized; 46,754,930 and 48,807,748 shares issued and outstanding as of March 31, 2022 and December 31, 2021, respectively	47	49
Treasury stock, at cost, 7,730,184 and 5,388,469 shares as of March 31, 2022 and December 31, 2021, respectively	(58,267)	(47,281)
Additional paid-in capital	647,640	648,389
Accumulated deficit	(254,990)	(181,724)
Total Acacia Research Corporation stockholders' equity	334,430	419,433
Noncontrolling interests	11,042	11,042
Total stockholders' equity	345,472	430,475
Total liabilities, redeemable convertible preferred stock, and stockholders' equity	$ 661,440	$ 798,856