Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 101,812	$ 101,213
Short-term investments	126,849	125,126
Accounts receivable, net	24,274	23,730
Inventories	41,587	39,737
Prepaid expenses and other current assets	2,788	2,280
Total current assets	297,310	292,086
Property and equipment, net	63,428	64,837
Long-term investments	9,795	9,860
Goodwill	6,571
Acquisition-related intangible assets, net	7,178
Deferred income tax assets, net	477	481
Other long-term assets	7,940	1,644
Total assets	392,699	368,908
Current liabilities:
Accounts payable	14,793	10,694
Accrued compensation and related benefits	6,607	10,419
Accrued liabilities	15,528	17,376
Total current liabilities	36,928	38,489
Income tax liabilities	4,746	5,542
Other long-term liabilities	9,364	1,478
Total liabilities	51,038	45,509
Commitments and contingencies (Notes 8 and 12)
Stockholders' equity:
Common stock, $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 38,804 and 38,291 as of September 30, 2014 and December 31, 2013, respectively	238,602	234,201
Retained earnings	97,398	82,938
Accumulated other comprehensive income	5,661	6,260
Total stockholders’ equity	341,661	323,399
Total liabilities and stockholders’ equity	$ 392,699	$ 368,908