Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 172,960	$ 172,704
Short-term investments	282,437	204,577
Accounts receivable, net	52,704	55,214
Inventories	127,500	136,384
Other current assets	19,605	11,931
Total current assets	655,206	580,810
Property and equipment, net	228,315	150,001
Long-term investments	3,138	3,241
Goodwill	6,571	6,571
Deferred tax assets, net	17,193	16,830
Other long-term assets	45,952	35,979
Total assets	956,375	793,432
Current liabilities:
Accounts payable	27,271	22,678
Accrued compensation and related benefits	26,164	18,799
Other accrued liabilities	44,790	38,962
Total current liabilities	98,225	80,439
Income tax liabilities	37,596	34,375
Other long-term liabilities	47,063	38,525
Total liabilities	182,884	153,339
Commitments and contingencies
Stockholders’ equity:
Common stock and additional paid-in capital: $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 43,616 and 42,505, respectively	549,517	450,908
Retained earnings	229,450	194,728
Accumulated other comprehensive loss	(5,476)	(5,543)
Total stockholders’ equity	773,491	640,093
Total liabilities and stockholders’ equity	$ 956,375	$ 793,432