Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 76,826	$ 112,703
Short-term investments	201,815	155,521
Accounts receivable, net	38,115	34,248
Inventories	78,535	71,469
Other current assets	11,045	9,043
Total current assets	406,336	382,984
Property and equipment, net	85,617	85,171
Long-term investments	5,342	5,354
Goodwill	6,571	6,571
Acquisition-related intangible assets, net	2,489	3,002
Deferred tax assets, net	641	633
Other long-term assets	29,808	27,411
Total assets	536,804	511,126
Current liabilities:
Accounts payable	22,637	17,427
Accrued compensation and related benefits	10,454	12,578
Accrued liabilities	22,917	22,916
Total current liabilities	56,008	52,921
Income tax liabilities	4,111	3,870
Other long-term liabilities	25,557	23,219
Total liabilities	85,676	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: 41,239 and 40,793 as of March 31, 2017 and December 31, 2016, respectively	334,222	315,969
Retained earnings	119,613	119,362
Accumulated other comprehensive loss	(2,707)	(4,215)
Total stockholders’ equity	451,128	431,116
Total liabilities and stockholders’ equity	$ 536,804	$ 511,126