CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 28,701	$ 48,820
Investments - current	121,997	100,918
Accounts and other receivables	2,558	1,235
Prepaid expenses and other current assets	7,589	9,347
Total current assets	160,845	160,320
Property and equipment, net	231	293
Investments - noncurrent	29,855	17,040
Long-term deposits	6,230	4,324
Deferred tax assets	7,217	7,217
Other assets	303	916
Total assets	204,681	190,110
Current liabilities:
Accounts payable	44	86
Accrued compensation	616	2,029
Deferred revenue - current	4,731	4,766
Other current liabilities	20,424	12,465
Total current liabilities	25,815	19,346
Deferred revenue - noncurrent	9,088	12,629
Other long-term liabilities	345	435
Total liabilities	35,248	32,410
Commitments and contingencies (Note 5)
Stockholders’ equity:
Common stock and additional paid-in capital	322,747	322,714
Accumulated other comprehensive income	1,195	202
Accumulated deficit	(52,030)	(70,016)
Treasury stock	(102,479)	(95,200)
Total stockholders’ equity	169,433	157,700
Total liabilities and stockholders’ equity	$ 204,681	$ 190,110