Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 179,466	$ 172,960
Short-term investments	372,076	282,437
Accounts receivable, net	93,535	52,704
Inventories	148,096	127,500
Other current assets	25,970	19,605
Total current assets	819,143	655,206
Property and equipment, net	270,310	228,315
Long-term investments	2,916	3,138
Goodwill	6,571	6,571
Deferred tax assets, net	13,486	17,193
Other long-term assets	48,868	45,952
Total assets	1,161,294	956,375
Current liabilities:
Accounts payable	48,142	27,271
Accrued compensation and related benefits	48,362	26,164
Other accrued liabilities	61,774	44,790
Total current liabilities	158,278	98,225
Income tax liabilities	35,624	37,596
Other long-term liabilities	52,823	47,063
Total liabilities	246,725	182,884
Commitments and contingencies
Stockholders’ equity:
Common stock and additional paid-in capital: $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 45,096 and 43,616, respectively	632,432	549,517
Retained earnings	279,653	229,450
Accumulated other comprehensive income (loss)	2,484	(5,476)
Total stockholders’ equity	914,569	773,491
Total liabilities and stockholders’ equity	$ 1,161,294	$ 956,375