Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 126,266	$ 101,213
Short-term investments	112,452	125,126
Accounts receivable, net	25,630	23,730
Inventories	40,918	39,737
Prepaid expenses and other current assets	2,880	2,280
Total current assets	308,146	292,086
Property and equipment, net	62,942	64,837
Long-term investments	5,389	9,860
Goodwill	6,571
Acquisition-related intangible assets, net	6,812
Deferred tax assets, net	1,049	481
Other long-term assets	8,457	1,644
Total assets	399,366	368,908
Current liabilities:
Accounts payable	13,138	10,694
Accrued compensation and related benefits	9,020	10,419
Accrued liabilities	14,703	17,376
Total current liabilities	36,861	38,489
Deferred tax and other tax liabilities	5,876	5,542
Other long-term liabilities	10,204	1,478
Total liabilities	52,941	45,509
Commitments and contingencies (notes 11, 12 and 13)
Stockholders' equity:
Common stock, $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 38,832 and 38,291 as of December 31, 2014 and December 31, 2013, respectively	240,500	234,201
Retained earnings	100,114	82,938
Accumulated other comprehensive income	5,811	6,260
Total stockholders’ equity	346,425	323,399
Total liabilities and stockholders’ equity	$ 399,366	$ 368,908