Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 226,091	$ 334,944
Short-term investments	515,947	260,169
Accounts receivable, net	79,859	66,843
Inventories	208,062	157,062
Other current assets	34,535	22,980
Total current assets	1,064,494	841,998
Property and equipment, net	340,060	281,528
Goodwill	6,571	6,571
Deferred tax assets, net	17,726	18,556
Other long-term assets	67,050	59,838
Total assets	1,495,901	1,208,491
Current liabilities:
Accounts payable	72,092	38,169
Accrued compensation and related benefits	75,815	45,840
Other accrued liabilities	79,756	62,960
Total current liabilities	227,663	146,969
Income tax liabilities	41,019	37,062
Other long-term liabilities	64,506	57,873
Total liabilities	333,188	241,904
Commitments and contingencies
Stockholders’ equity:
Common stock and additional paid-in capital: $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 46,091 and 45,267, respectively	769,858	657,701
Retained earnings	381,193	298,746
Accumulated other comprehensive income	11,662	10,140
Total stockholders’ equity	1,162,713	966,587
Total liabilities and stockholders’ equity	$ 1,495,901	$ 1,208,491