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Financial Statement Details (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Available-for-sale:
Amortized Cost	$ 39,241	$ 41,773
Gross Unrealized Gains	24	8
Gross Unrealized Losses	0	(19)
Estimated Fair Value	39,265	41,762
Short-term marketable securities [Member]
Available-for-sale:
Amortized Cost	38,041	28,275
Gross Unrealized Gains	23	2
Gross Unrealized Losses	0	(10)
Estimated Fair Value	38,064	28,267
Long-term marketable securities [Member]
Available-for-sale:
Amortized Cost	1,200	13,498
Gross Unrealized Gains	1	6
Gross Unrealized Losses	0	(9)
Estimated Fair Value	1,201	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	3,264	6,913
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0	(1)
Estimated Fair Value	3,266	6,912
Government agency securities [Member] | Long-term marketable securities [Member]
Available-for-sale:
Maturity in Years		1 to 2
Amortized Cost		3,734
Gross Unrealized Gains		4
Gross Unrealized Losses		0
Estimated Fair Value		3,738
Municipal bonds [Member] | Short-term marketable securities [Member]
Available-for-sale:
Maturity in Years	1 or less	1 or less
Amortized Cost	11,246	8,390
Gross Unrealized Gains	14	0
Gross Unrealized Losses	0	(6)
Estimated Fair Value	11,260	8,384
Municipal bonds [Member] | Long-term marketable securities [Member]
Available-for-sale:
Maturity in Years		1 to 2
Amortized Cost		5,967
Gross Unrealized Gains		2
Gross Unrealized Losses		0
Estimated Fair Value		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	6,200	4,319
Gross Unrealized Gains	5	2
Gross Unrealized Losses	0	0
Estimated Fair Value	6,205	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	1,200	3,797
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0	(9)
Estimated Fair Value	1,201	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	17,330	8,615
Gross Unrealized Gains	3	0
Gross Unrealized Losses	0	(3)
Estimated Fair Value	17,333	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		0
Gross Unrealized Losses		0
Estimated Fair Value		$ 38

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