CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 61,862	$ 77,617
Short-term marketable securities	283,665	145,918
Trade receivables, net of allowances	27,178	27,625
Inventory	5,079	4,988
Prepaid expenses and other current assets	10,436	10,315
Total current assets	388,220	266,463
Strategic inventory	13,098	12,962
Operating lease right-of-use asset	2,816	514
Property and equipment, net of accumulated depreciation	726	1,002
Long-term marketable securities	22,566	112,277
Other assets	2,984	3,083
Deferred tax assets, net	37,713	27,455
Total assets	468,123	423,756
Current liabilities:
Accounts payable	9,269	6,908
Accrued research and development expenses	13,051	12,442
Accrued and other liabilities	32,660	27,665
Short-term operating lease liability	2,264	526
Total current liabilities	57,244	47,541
Long-term operating lease liability	552	0
Long-term accrued income taxes payable	2,516	409
Total liabilities	60,312	47,950
Stockholders’ equity:
Preferred stock	0	0
Common stock	128	127
Treasury stock	(417,448)	(410,411)
Additional paid-in capital	608,717	591,349
Accumulated other comprehensive loss	(1,351)	(227)
Retained earnings	217,765	194,968
Total stockholders’ equity	407,811	375,806
Total liabilities and stockholders’ equity	$ 468,123	$ 423,756