CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows provided by (used in) operating activities:
Net income	$ 5,076	$ 2,036
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	206	192
Stock-based compensation	1,141	531
Net gains on investment in marketable equity securities	(3,166)	0
Net losses on derivative instruments	2,795	0
Realized gains on investment in marketable debt securities	(368)	0
Foreign currency remeasurement gains	131	280
Other	(17)	24
Changes in operating assets and liabilities:
Accounts and other receivables	(109)	184
Prepaid expenses and other current assets	1,644	1,396
Long-term deposits	4,611	0
Other assets	757	843
Accounts payable	52	305
Accrued compensation	12	(68)
Other current liabilities	(77)	280
Deferred revenue	(1,295)	(1,226)
Other long-term liabilities	(355)	(367)
Net cash provided by operating activities	11,038	4,410
Cash flows provided by (used in) investing activities:
Purchases of marketable securities	(36,778)	0
Proceeds from sale or maturities of marketable securities and other investments	39,899	0
Proceeds from sale of derivative instruments	6,817	0
Payments for settlement of derivative instruments	(5,105)	0
Purchases of property and equipment	0	(57)
Net cash provided by (used in) investing activities	4,833	(57)
Cash flows provided by (used in) financing activities:
Proceed from issuance of common stock, net of issuance costs	5	35,937
Proceeds from issuance of common stock under employee stock purchase plan	34	89
Proceeds from stock options exercises	0	2,723
Cash paid for purchases of treasury stock	(4,442)	0
Net cash provided by (used in) financing activities	(4,403)	38,749
Net increase in cash and cash equivalents	11,468	43,102
Cash and cash equivalents:
Beginning of year	51,490	59,522
End of year	62,958	102,624
Supplemental disclosure of cash flow information:
Cash paid for income taxes	17	13
Supplemental disclosure of non-cash operating, investing, and financing activities:
Release of restricted stock units and awards under company stock plan	612	2,367
Leased assets obtained in exchange for new operating lease liabilities	$ 120	$ 0