CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net (loss)	$ (27,871)	$ (36,260)
Adjustments to reconcile net (loss) to net cash from operating activities:
Depreciation	9	7
Stock-based compensation	2,778	3,330
Bad debt	15	0
Deferred income taxes	0	16,032
Changes in assets and liabilities:
Prepaid expenses and other current assets	(3,369)	331
Accounts payable and accrued liabilities	67	35
Other liabilities	3,596	(54)
Accrued payroll and related expenses	5	41
Accrued licensing costs	0	(355)
Accounts receivables	(3)	3
Prepaid income taxes	0	(3)
Net cash used in operating activities	(24,773)	(16,893)
Cash flows from investing activities:
Purchase of property and equipment	(65)	0
Purchase of investments at cost	(2,500)	0
Purchase of investments	(47,215)	(67,070)
Proceeds from sale or maturity of investments	85,721	28,535
Net cash provided by (used in) investing activities	35,941	(38,535)
Cash flows from financing activities:
Dividend	(71,429)	0
Withholding taxes paid on cashless exercise of restricted stock and restricted stock units	(11)	(29)
Net cash used in financing activities	(71,440)	(29)
Net (decrease) in cash and cash equivalents	(60,272)	(55,457)
Cash and cash equivalents, beginning of period	86,561	142,018
Cash and cash equivalents, end of period	26,289	86,561
Cash paid for income taxes	$ 0	$ 2