Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 80,868	$ 126,266
Short-term investments	150,166	112,452
Accounts receivable, net	26,765	25,630
Inventories	64,964	40,918
Prepaid expenses and other current assets	2,554	2,880
Total current assets	325,317	308,146
Property and equipment, net	62,163	62,942
Long-term investments	5,375	5,389
Goodwill	6,571	6,571
Acquisition-related intangible assets, net	6,078	6,812
Deferred tax assets, net	1,053	1,049
Other long-term assets	11,066	8,457
Total assets	417,623	399,366
Current liabilities:
Accounts payable	16,596	13,138
Accrued compensation and related benefits	11,236	9,020
Accrued liabilities	18,402	14,703
Total current liabilities	46,234	36,861
Deferred tax and other tax liabilities	3,018	5,876
Other long-term liabilities	13,609	10,204
Total liabilities	62,861	52,941
Stockholders' equity:
Common stock, $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 39,617 and 38,832 as of June 30, 2015 and December 31, 2014, respectively	251,553	240,500
Retained earnings	97,023	100,114
Accumulated other comprehensive income	6,186	5,811
Total stockholders’ equity	354,762	346,425
Total liabilities and stockholders’ equity	$ 417,623	$ 399,366