CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows provided by (used in) operating activities:
Net income	$ 8,278	$ 5,076
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Depreciation of property and equipment	21	35
Reduction in carrying value of right of use assets	151	171
Stock-based compensation	946	1,141
Net gains on investment in marketable securities	(3,683)	(3,534)
Net (gain) loss on derivative instruments	(615)	2,795
Foreign currency remeasurement losses	0	131
Shares issued to an employee in lieu of cash compensation	385	0
Other	(26)	(17)
Changes in operating assets and liabilities:
Accounts and other receivables	(501)	(109)
Prepaid expenses and other current assets	383	1,644
Long-term deposits	18	4,611
Other assets	113	757
Accounts payable	(68)	52
Accrued compensation	(1,259)	12
Other current liabilities	602	(77)
Deferred revenue	(1,189)	(1,295)
Other long-term liabilities	(33)	(355)
Net cash and cash equivalents provided by operating activities	3,523	11,038
Cash flows provided by (used in) investing activities:
Purchases of marketable securities and other investments	(54,954)	(36,778)
Proceeds from sale or maturities of marketable securities and other investments	30,771	39,899
Proceeds from sale of derivative instruments	5,844	6,817
Payments for settlement of derivative instruments	(1,369)	(5,105)
Net cash and cash equivalents provided by (used in) investing activities	(19,708)	4,833
Cash flows provided by (used in) financing activities:
Dividends payments to stockholders	(4,400)	0
Payment for purchases of treasury stock	0	(4,442)
Shares withheld to cover payroll taxes	(757)	0
Other financing activities	6	39
Net cash and cash equivalents used in financing activities	(5,151)	(4,403)
Net increase (decrease) in cash and cash equivalents	(21,336)	11,468
Cash and cash equivalents:
Beginning of period	48,820	51,490
End of period	27,484	62,958
Supplemental disclosure of cash flow information:
Cash paid for income taxes	19	17
Supplemental disclosure of non-cash investing, and financing activities:
Dividends declared but not yet paid	1,015	0
Leased assets obtained in exchange for new operating lease liabilities	$ 0	$ 120