Condensed Consolidated Balance Sheets (Current Period Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 95,966	$ 126,266
Short-term investments	137,791	112,452
Accounts receivable, net	25,343	25,630
Inventories	53,396	40,918
Prepaid expenses and other current assets	2,727	2,880
Total current assets	315,223	308,146
Property and equipment, net	64,256	62,942
Long-term investments	5,394	5,389
Goodwill	6,571	6,571
Acquisition-related intangible assets, net	6,445	6,812
Deferred tax assets, net	1,052	1,049
Other long-term assets	10,689	8,457
Total assets	409,630	399,366
Current liabilities:
Accounts payable	19,900	13,138
Accrued compensation and related benefits	7,366	9,020
Accrued liabilities	18,626	14,703
Total current liabilities	45,892	36,861
Deferred tax and other tax liabilities	6,016	5,876
Other long-term liabilities	12,270	10,204
Total liabilities	64,178	52,941
Commitments and contingencies (notes 8 and 12)
Stockholders' equity:
Common stock, $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 39,253 and 38,832 as of March 31, 2015 and December 31, 2014, respectively	241,737	240,500
Retained earnings	97,619	100,114
Accumulated other comprehensive income	6,096	5,811
Total stockholders’ equity	345,452	346,425
Total liabilities and stockholders’ equity	$ 409,630	$ 399,366