Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 220,210	$ 334,944
Short-term investments	450,078	260,169
Accounts receivable, net	77,553	66,843
Inventories	177,322	157,062
Other current assets	24,917	22,980
Total current assets	950,080	841,998
Property and equipment, net	332,093	281,528
Goodwill	6,571	6,571
Deferred tax assets, net	17,699	18,556
Other long-term assets	66,548	59,838
Total assets	1,372,991	1,208,491
Current liabilities:
Accounts payable	58,882	38,169
Accrued compensation and related benefits	55,279	45,840
Other accrued liabilities	68,570	62,960
Total current liabilities	182,731	146,969
Income tax liabilities	38,498	37,062
Other long-term liabilities	64,407	57,873
Total liabilities	285,636	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: 45,917 and 45,267, respectively	733,672	657,701
Retained earnings	341,382	298,746
Accumulated other comprehensive income	12,301	10,140
Total stockholders’ equity	1,087,355	966,587
Total liabilities and stockholders’ equity	$ 1,372,991	$ 1,208,491