Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 101,213	$ 75,104
Short-term investments	125,126	85,521
Accounts receivable, net of allowances of $0 as of December 31, 2013 and $20 as of December 31, 2012	23,730	19,383
Inventories	39,737	32,115
Deferred income tax assets, net	294	1
Prepaid expenses and other current assets	1,986	2,177
Total current assets	292,086	214,301
Property and equipment, net	64,837	59,412
Long-term investments	9,860	11,755
Deferred income tax assets, net	481	669
Other long-term assets	1,644	1,025
Total assets	368,908	287,162
Current liabilities:
Accounts payable	10,694	9,859
Accrued compensation and related benefits	10,419	7,686
Accrued liabilities	17,376	5,915
Total current liabilities	38,489	23,460
Income tax liabilities	5,542	5,408
Other long-term liabilities	1,478
Total liabilities	45,509	28,868
Commitments and contingencies (Notes 8, 9 and 10)
Stockholders' equity:
Common stock, $0.001 par value; shares authorized: 150,000; shares issued and outstanding: 38,291 and 35,673 as of December 31, 2013 and December 31, 2012, respectively	234,201	194,079
Retained earnings	82,938	60,040
Accumulated other comprehensive income	6,260	4,175
Total stockholders’ equity	323,399	258,294
Total liabilities and stockholders’ equity	$ 368,908	$ 287,162