Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 205,229	$ 172,704
Short-term investments	213,511	204,577
Accounts receivable, net	58,261	55,214
Inventories	135,634	136,384
Other current assets	16,660	11,931
Total current assets	629,295	580,810
Property and equipment, net	217,043	150,001
Long-term investments	3,264	3,241
Goodwill	6,571	6,571
Deferred tax assets, net	16,619	16,830
Other long-term assets	43,343	35,979
Total assets	916,135	793,432
Current liabilities:
Accounts payable	30,318	22,678
Accrued compensation and related benefits	28,724	18,799
Other accrued liabilities	45,984	38,962
Total current liabilities	105,026	80,439
Income tax liabilities	32,402	34,375
Other long-term liabilities	44,279	38,525
Total liabilities	181,707	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: 43,435 and 42,505, respectively	528,775	450,908
Retained earnings	215,692	194,728
Accumulated other comprehensive loss	(10,039)	(5,543)
Total stockholders’ equity	734,428	640,093
Total liabilities and stockholders’ equity	$ 916,135	$ 793,432