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Balance Sheet Details (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Available-for-sale:
Amortized Cost	$ 46,096	$ 41,773
Gross Unrealized Gains	36	8
Gross Unrealized Losses		(19)
Estimated Fair Value	46,132	41,762
Short-term marketable securities [Member]
Available-for-sale:
Amortized Cost	39,934	28,275
Gross Unrealized Gains	24	2
Gross Unrealized Losses		(10)
Estimated Fair Value	39,958	28,267
Long-term marketable securities [Member]
Available-for-sale:
Amortized Cost	6,162	13,498
Gross Unrealized Gains	12	6
Gross Unrealized Losses		(9)
Estimated Fair Value	6,174	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	3,681	6,913
Gross Unrealized Gains
Gross Unrealized Losses		(1)
Estimated Fair Value	3,681	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	3,000	3,734
Gross Unrealized Gains	1	4
Gross Unrealized Losses
Estimated Fair Value	3,001	3,738
Municipal bonds [Member] | Short-term marketable securities [Member]
Available-for-sale:
Maturity in Years	1 or less	1 or less
Amortized Cost	14,678	8,390
Gross Unrealized Gains	11
Gross Unrealized Losses		(6)
Estimated Fair Value	14,689	8,384
Municipal bonds [Member] | Long-term marketable securities [Member]
Available-for-sale:
Maturity in Years	1 to 2	1 to 2
Amortized Cost	804	5,967
Gross Unrealized Gains	1	2
Gross Unrealized Losses
Estimated Fair Value	805	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	4,079	4,319
Gross Unrealized Gains	2	2
Gross Unrealized Losses
Estimated Fair Value	4,081	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	2,358	3,797
Gross Unrealized Gains	10
Gross Unrealized Losses		(9)
Estimated Fair Value	2,368	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	17,496	8,615
Gross Unrealized Gains	11
Gross Unrealized Losses		(3)
Estimated Fair Value	17,507	8,612
Marketable equity securities [Member] | Short-term marketable securities [Member]
Available-for-sale:
Maturity in Years		1 or less
Amortized Cost		38
Estimated Fair Value		$ 38

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