CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 91,097	$ 56,071
Investments - current	88,010	104,291
Accounts and other receivables	6,028	2,241
Prepaid expenses and other current assets	8,701	9,847
Total current assets	193,836	172,450
Property and equipment, net	170	211
Investments - noncurrent	40,958	33,350
Long-term deposits	6,394	6,231
Deferred tax assets	3,343	3,343
Other assets	1	146
Total assets	244,702	215,731
Current liabilities:
Accounts payable	21	47
Accrued compensation	3,187	3,127
Deferred revenue - current	12,314	4,239
Other current liabilities	14,586	11,900
Total current liabilities	30,108	19,313
Deferred revenue - noncurrent	8,213	8,390
Other long-term liabilities	4,925	4,926
Total liabilities	43,246	32,629
Commitments and contingencies (Note 5)
Stockholders’ equity:
Common stock and additional paid-in capital	322,310	322,182
Accumulated other comprehensive income	1,530	1,702
Accumulated deficit	(17,385)	(36,040)
Treasury stock	(104,999)	(104,742)
Total stockholders’ equity	201,456	183,102
Total liabilities and stockholders’ equity	$ 244,702	$ 215,731