CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 190,459	$ 178,690
Short-term marketable securities	232,183	232,398
Accounts receivable, net	20,597	24,274
Inventories	96,633	90,380
Prepaid expenses and other current assets	20,570	15,597
Total current assets	560,442	541,339
PROPERTY AND EQUIPMENT, net	123,430	116,619
INTANGIBLE ASSETS, net	15,748	16,865
GOODWILL	91,849	91,849
DEFERRED TAX ASSETS	1,739	2,836
OTHER ASSETS	34,231	34,388
Total assets	827,439	803,896
CURRENT LIABILITIES:
Accounts payable	37,156	27,433
Accrued payroll and related expenses	10,921	13,408
Taxes payable	567	584
Other accrued liabilities	5,826	9,051
Total current liabilities	54,470	50,476
LONG-TERM INCOME TAXES PAYABLE	14,840	14,617
DEFERRED TAX LIABILITIES	162	164
OTHER LIABILITIES	14,137	14,093
Total liabilities	83,609	79,350
COMMITMENTS AND CONTINGENCIES (Notes 11, 12 and 13)
STOCKHOLDERS’ EQUITY:
Common stock	28	28
Additional paid-in capital	162,343	152,117
Accumulated other comprehensive loss	(4,314)	(3,130)
Retained earnings	585,773	575,531
Total stockholders’ equity	743,830	724,546
Total liabilities and stockholders’ equity	$ 827,439	$ 803,896