CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows provided by (used in) operating activities:
Net income	$ 30,664	$ 12,484
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Depreciation of property and equipment	140	99
Reduction in carrying value of right of use assets	672	663
Stock-based compensation	3,417	2,338
Net (gain) loss on investment in marketable securities	7,884	(479)
Net losses (gains) on derivative instruments	(4,831)	1,364
Impairment of long-term deposits	0	2,166
Foreign currency remeasurement losses	145	635
Deferred income taxes	(5,101)	531
Shares issued to an employee in lieu of cash compensation	157	0
Other	23	23
Changes in operating assets and liabilities:
Accounts and other receivables	735	248
Prepaid expenses and other current assets	4,085	(823)
Long-term deposits	5,196	110
Other assets	1,226	2,952
Accounts payable	84	(148)
Accrued compensation	1,474	(446)
Other current liabilities	(1,775)	2,205
Deferred revenue	(4,130)	(4,982)
Other long-term liabilities	81	(1,491)
Net cash and cash equivalents provided by operating activities	40,146	17,449
Cash flows provided by (used in) investing activities:
Purchases of marketable securities and other investments	151,306	109,408
Proceeds from sale or maturities of marketable securities and other investments	119,714	17,156
Proceeds from sale of derivative instruments	16,265	18,919
Payments for settlement of derivative instruments	(14,052)	(14,016)
Purchases of property and equipment	(30)	(335)
Proceeds from sale of fixed assets	4	0
Net cash and cash equivalents used in investing activities	(29,405)	(87,684)
Cash flows provided by (used in) financing activities:
Payment for purchases of treasury stock	(13,238)	0
Shares withheld to cover payroll taxes	229	0
Proceeds from issuance of common stock, net of issuance costs	5	59,189
Proceeds from issuance of common stock under employee stock purchase plan	51	150
Proceeds from stock options exercises	0	2,864
Net cash and cash equivalents provided by (used in) financing activities	(13,411)	62,203
Net decrease in cash and cash equivalents	(2,670)	(8,032)
Cash and cash equivalents:
Beginning of period	51,490	59,522
End of period	48,820	51,490
Supplemental disclosure of cash flow information:
Cash paid for income taxes	1,408	88
Supplemental disclosure of non-cash investing, and financing activities:
Dividends declared but not yet paid	4,212	0
Leased assets obtained in exchange for new operating lease liabilities	$ 120	$ 0