Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 334,944	$ 172,960
Short-term investments	260,169	282,437
Accounts receivable, net	66,843	52,704
Inventories	157,062	127,500
Other current assets	22,980	19,605
Total current assets	841,998	655,206
Property and equipment, net	281,528	228,315
Goodwill	6,571	6,571
Deferred tax assets, net	18,556	17,193
Other long-term assets	59,838	49,090
Total assets	1,208,491	956,375
Current liabilities:
Accounts payable	38,169	27,271
Accrued compensation and related benefits	45,840	26,164
Other accrued liabilities	62,960	44,790
Total current liabilities	146,969	98,225
Income tax liabilities	37,062	37,596
Other long-term liabilities	57,873	47,063
Total liabilities	241,904	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: 45,267 and 43,616, respectively	657,701	549,517
Retained earnings	298,746	229,450
Accumulated other comprehensive income (loss)	10,140	(5,476)
Total stockholders’ equity	966,587	773,491
Total liabilities and stockholders’ equity	$ 1,208,491	$ 956,375