Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 109,479	$ 90,860
Short-term investments	149,584	144,103
Accounts receivable, net	33,335	30,830
Inventories	70,692	63,209
Other current assets	3,720	2,926
Total current assets	366,810	331,928
Property and equipment, net	82,097	65,359
Long-term investments	5,382	5,361
Goodwill	6,571	6,571
Acquisition-related intangible assets, net	3,515	5,053
Deferred tax assets, net	644	672
Other long-term assets	29,837	16,341
Total assets	494,856	431,285
Current liabilities:
Accounts payable	17,332	13,487
Accrued compensation and related benefits	16,311	9,812
Accrued liabilities	21,873	19,984
Total current liabilities	55,516	43,283
Income tax liabilities	3,594	2,941
Other long-term liabilities	19,448	16,545
Total liabilities	78,558	62,769
Stockholders' equity:
Common stock and additional paid-in capital, $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 40,661 and 39,689 as of September 30, 2016 and December 31, 2015, respectively	304,700	265,763
Retained earnings	111,535	101,287
Accumulated other comprehensive income	63	1,466
Total stockholders’ equity	416,298	368,516
Total liabilities and stockholders’ equity	$ 494,856	$ 431,285