CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 56,071	$ 48,820
Investments-current	104,291	100,918
Accounts and other receivables	2,241	1,235
Prepaid expenses and other current assets	9,847	9,347
Total current assets	172,450	160,320
Property and equipment, net	211	293
Investments-noncurrent	33,350	17,040
Long-term deposits	6,231	4,324
Deferred tax assets	3,343	7,217
Other assets	146	916
Total assets	215,731	190,110
Current liabilities:
Accounts payable	47	86
Accrued compensation	3,127	2,029
Deferred revenue-current	4,239	4,766
Other current liabilities	11,900	11,044
Total current liabilities	19,313	17,925
Deferred revenue - noncurrent	8,390	12,629
Other noncurrent liabilities	4,926	1,856
Total liabilities	32,629	32,410
Stockholders’ equity:
Common stock and additional paid-in capital – $0.001 par value; 100,000,000 shares authorized; 47,636,273 and 46,974,629 shares issued, respectively; 31,528,977 and 32,247,047 shares outstanding, respectively	322,182	322,714
Accumulated other comprehensive income	1,702	202
Accumulated deficit	(36,040)	(70,016)
Treasury stock at cost: 16,107,296 and 14,727,582 shares, respectively	(104,742)	(95,200)
Total stockholders’ equity	183,102	157,700
Total liabilities and stockholders’ equity	$ 215,731	$ 190,110