Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 308,943	$ 165,546
Equity securities at fair value	361,778	109,103
Equity securities without readily determinable fair value	5,816	143,257
Investment securities - equity method investments	30,934	30,673
Investment at fair value	0	2,752
Accounts receivable, net	9,517	506
Inventories	8,930	0
Prepaid expenses and other current assets	4,764	5,832
Total current assets	730,682	457,669
Long-term restricted cash	418	35,000
Property, plant and equipment, net	4,183	270
Goodwill	7,470	0
Other intangible assets, net	48,793	16,912
Leased right-of-use assets	2,027	951
Other non-current assets	5,283	505
Total assets	798,856	511,307
Current liabilities:
Accounts payable	5,440	1,019
Accrued expenses and other current liabilities	5,789	3,707
Accrued compensation	4,136	2,265
Royalties and contingent legal fees payable	2,463	2,162
Deferred revenue	1,114	0
Senior Secured Notes Payable	181,248	115,663
Total current liabilities	200,190	124,816
Deferred revenue, net of current portion	581	0
Series A warrant liabilities	11,291	6,640
Series A embedded derivative liabilities	18,448	26,728
Series B warrant liabilities	96,378	52,341
Long-term lease liabilities	2,027	951
Deferred income tax liabilities, net	18,552	0
Other long-term liabilities	6,161	591
Total liabilities	353,628	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 December 31, 2021 and 2020; aggregate liquidation preference of $35,000 as of December 31, 2021 and 2020	14,753	10,924
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; 48,807,748 and 49,279,453 shares issued and outstanding as of December 31, 2021 and 2020, respectively	49	49
Treasury stock, at cost, 5,388,469 and 4,604,365 shares as of December 31, 2021 and 2020, respectively	(47,281)	(43,270)
Additional paid-in capital	648,389	651,416
Accumulated deficit	(181,724)	(330,921)
Total Acacia Research Corporation stockholders' equity	419,433	277,274
Noncontrolling interests	11,042	11,042
Total stockholders' equity	430,475	288,316
Total liabilities, redeemable convertible preferred stock, and stockholders' equity	$ 798,856	$ 511,307