CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net (loss) income	$ (4,467)	$ (3,320)
Adjustments to reconcile net (loss) income to cash flows from operating activities:
Depreciation	1	2
Deferred tax assets	0	(1,059)
Bad debt	10	0
Stock-based compensation	682	778
Changes in assets and liabilities:
Accounts receivables	0	5
Prepaid expenses and other assets	(301)	(369)
Accounts payable	1,320	313
Accrued payroll and related expenses	54	60
Accrued licensing costs	0	(355)
Other liabilities	(10)	(17)
Net cash (used in) operating activities	(2,711)	(3,962)
Cash flows from investing activities:
Purchase of investments	(16,638)	(4,060)
Proceeds from sale or maturity of investments	29,838	2,412
Net cash provided by (used in) investing activities	13,200	(1,648)
Net change in cash and cash equivalents	10,489	(5,610)
Cash and cash equivalents, beginning of period	86,561	142,018
Cash and cash equivalents, end of period	97,050	136,408
Non-cash transactions
Dividends approved and accrued on March 30, 2023, paid in April 2023	$ 71,429	$ 0