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Balance Sheet Details (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Available-for-sale:
Amortized Cost	$ 47,202	$ 41,773
Gross Unrealized Gains	20	8
Gross Unrealized Losses	(11)	(19)
Estimated Fair Value	47,211	41,762
Short-term marketable securities [Member]
Available-for-sale:
Amortized Cost	36,398	28,275
Gross Unrealized Gains	4	2
Gross Unrealized Losses	(11)	(10)
Estimated Fair Value	36,391	28,267
Long-term marketable securities [Member]
Available-for-sale:
Amortized Cost	10,804	13,498
Gross Unrealized Gains	16	6
Gross Unrealized Losses		(9)
Estimated Fair Value	10,820	13,495
Government agency securities [Member] | Short-term marketable securities [Member]
Available-for-sale:
Maturity in Years	1 or less	1 or less
Amortized Cost	2,181	6,913
Gross Unrealized Gains
Gross Unrealized Losses	(1)	(1)
Estimated Fair Value	2,180	6,912
Government agency securities [Member] | Long-term marketable securities [Member]
Available-for-sale:
Maturity in Years	1 to 2	1 to 2
Amortized Cost	3,733	3,734
Gross Unrealized Gains	5	4
Gross Unrealized Losses
Estimated Fair Value	3,738	3,738
Municipal bonds [Member] | Short-term marketable securities [Member]
Available-for-sale:
Maturity in Years	1 or less	1 or less
Amortized Cost	11,730	8,390
Gross Unrealized Gains	2
Gross Unrealized Losses		(6)
Estimated Fair Value	11,732	8,384
Municipal bonds [Member] | Long-term marketable securities [Member]
Available-for-sale:
Maturity in Years	1 to 2	1 to 2
Amortized Cost	4,714	5,967
Gross Unrealized Gains	2	2
Gross Unrealized Losses
Estimated Fair Value	4,716	5,969
Certificates of deposit [Member] | Short-term marketable securities [Member]
Available-for-sale:
Maturity in Years	1 or less	1 or less
Amortized Cost	5,040	4,319
Gross Unrealized Gains	1	2
Gross Unrealized Losses
Estimated Fair Value	5,041	4,321
Certificates of deposit [Member] | Long-term marketable securities [Member]
Available-for-sale:
Maturity in Years	1 to 2	1 to 2
Amortized Cost	2,357	3,797
Gross Unrealized Gains	9
Gross Unrealized Losses		(9)
Estimated Fair Value	2,366	3,788
Corporate debentures / bonds [Member] | Short-term marketable securities [Member]
Available-for-sale:
Maturity in Years	1 or less	1 or less
Amortized Cost	17,447	8,615
Gross Unrealized Gains	1
Gross Unrealized Losses	(10)	(3)
Estimated Fair Value	17,438	8,612
Marketable equity securities [Member] | Short-term marketable securities [Member]
Available-for-sale:
Maturity in Years		1 or less
Amortized Cost		38
Gross Unrealized Gains
Gross Unrealized Losses
Estimated Fair Value		$ 38

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