UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 164,280	$ 57,359
Trading securities - debt	0	93,843
Trading securities - equity	19,697	17,140
Equity securities derivative	7,369	0
Equity securities forward contract	75,534	0
Prepaid investment	93,956	0
Accounts receivable	1,393	511
Prepaid expenses and other current assets	1,894	2,912
Total current assets	364,123	171,765
Long-term restricted cash	0	35,000
Investment at fair value (Note 5)	4,063	1,500
Patents, net of accumulated amortization	19,245	7,814
Leased right-of-use assets	1,249	1,264
Other non-current assets	5,466	818
Total assets	394,146	218,161
Current liabilities:
Accounts payable	3,235	1,765
Accrued expenses and other current liabilities	2,716	7,265
Accrued compensation	1,998	507
Royalties and contingent legal fees payable	2,143	2,178
Senior Secured Notes Payable - short term	113,401	0
Total current liabilities	123,493	11,715
Series A warrant liabilities	6,952	3,568
Series A embedded derivative liabilities	29,513	17,974
Series B warrant liabilities	58,290	0
Long-term lease liabilities	1,249	1,264
Other long-term liabilities	593	593
Total liabilities	220,090	35,114
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, 2020 and December 31, 2019, respectively; aggregate liquidation preference of $35,000 as of June 30, 2020 and December 31, 2019, respectively	9,400	8,089
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; 49,306,137 and 50,370,987 shares issued and outstanding as of June 30, 2020 and December 31, 2019, respectively	49	50
Treasury stock, at cost, 4,604,365 and 2,919,828 shares as of June 30, 2020 and December 31, 2019, respectively	(43,270)	(39,272)
Additional paid-in capital	650,843	652,003
Accumulated deficit	(444,799)	(439,656)
Total Acacia Research Corporation stockholders' equity	162,823	173,125
Noncontrolling interests	1,833	1,833
Total stockholders' equity	164,656	174,958
Total liabilities, redeemable convertible preferred stock, and stockholders' equity	$ 394,146	$ 218,161