Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 82,046	$ 90,860
Short-term investments	161,818	144,103
Accounts receivable, net	31,351	30,830
Inventories	69,919	63,209
Other current assets	3,980	2,926
Total current assets	349,114	331,928
Property and equipment, net	74,293	65,359
Long-term investments	5,294	5,361
Goodwill	6,571	6,571
Acquisition-related intangible assets, net	4,027	5,053
Deferred tax assets, net	644	672
Other long-term assets	28,698	16,341
Total assets	468,641	431,285
Current liabilities:
Accounts payable	19,140	13,487
Accrued compensation and related benefits	14,116	9,812
Accrued liabilities	18,855	19,984
Total current liabilities	52,111	43,283
Income tax liabilities	3,328	2,941
Other long-term liabilities	18,062	16,545
Total liabilities	73,501	62,769
Stockholders' equity:
Common stock and additional paid-in capital, $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 40,480 and 39,689 as of June 30, 2016 and December 31, 2015, respectively	289,129	265,763
Retained earnings	105,883	101,287
Accumulated other comprehensive income	128	1,466
Total stockholders’ equity	395,140	368,516
Total liabilities and stockholders’ equity	$ 468,641	$ 431,285