Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 71,110	$ 112,703
Short-term investments	206,561	155,521
Accounts receivable, net	41,982	34,248
Inventories	92,666	71,469
Other current assets	14,894	9,043
Total current assets	427,213	382,984
Property and equipment, net	100,562	85,171
Long-term investments	5,348	5,354
Goodwill	6,571	6,571
Acquisition-related intangible assets, net	1,977	3,002
Deferred tax assets, net	650	633
Other long-term assets	25,725	27,411
Total assets	568,046	511,126
Current liabilities:
Accounts payable	25,232	17,427
Accrued compensation and related benefits	14,561	12,578
Accrued liabilities	22,993	22,916
Total current liabilities	62,786	52,921
Income tax liabilities	4,303	3,870
Other long-term liabilities	27,164	23,219
Total liabilities	94,253	80,010
Commitments and contingencies
Stockholders' equity:
Common stock and additional paid-in capital, $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 41,366 and 40,793 as of June 30, 2017 and December 31, 2016, respectively	349,447	315,969
Retained earnings	125,726	119,362
Accumulated other comprehensive loss	(1,380)	(4,215)
Total stockholders’ equity	473,793	431,116
Total liabilities and stockholders’ equity	$ 568,046	$ 511,126

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.