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Balance Sheet Details (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Available-for-sale:
Amortized Cost	$ 39,849	$ 39,241
Gross Unrealized Gains	15	24
Gross Unrealized Losses	(7)	0
Estimated Fair Value	39,857	39,265
Short-term marketable securities [Member]
Available-for-sale:
Amortized Cost	29,982	38,041
Gross Unrealized Gains	13	23
Gross Unrealized Losses	0	0
Estimated Fair Value	29,995	38,064
Long-term marketable securities [Member]
Available-for-sale:
Amortized Cost	9,867	1,200
Gross Unrealized Gains	2	1
Gross Unrealized Losses	(7)	0
Estimated Fair Value	9,862	1,201
Government agency securities [Member] | Short-term marketable securities [Member]
Available-for-sale:
Maturity in Years	1 or less	1 or less
Amortized Cost	4,272	3,265
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	0
Estimated Fair Value	4,272	3,266
Municipal bonds [Member] | Short-term marketable securities [Member]
Available-for-sale:
Maturity in Years	1 or less	1 or less
Amortized Cost	11,377	11,246
Gross Unrealized Gains	10	14
Gross Unrealized Losses	0	0
Estimated Fair Value	11,387	11,260
Municipal bonds [Member] | Long-term marketable securities [Member]
Available-for-sale:
Maturity in Years	1 to 2
Amortized Cost	1,668
Gross Unrealized Gains	2
Gross Unrealized Losses	0
Estimated Fair Value	1,670
Certificates of deposit [Member] | Short-term marketable securities [Member]
Available-for-sale:
Maturity in Years	1 or less	1 or less
Amortized Cost	4,999	6,200
Gross Unrealized Gains	0	5
Gross Unrealized Losses	0	0
Estimated Fair Value	4,999	6,205
Certificates of deposit [Member] | Long-term marketable securities [Member]
Available-for-sale:
Maturity in Years	1 to 2	1 to 2
Amortized Cost	1,920	1,200
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	0
Estimated Fair Value	1,920	1,201
Corporate debentures / bonds [Member] | Short-term marketable securities [Member]
Available-for-sale:
Maturity in Years	1 or less	1 or less
Amortized Cost	9,334	17,330
Gross Unrealized Gains	3	3
Gross Unrealized Losses	0	0
Estimated Fair Value	9,337	17,333
Corporate debentures / bonds [Member] | Long-term marketable securities [Member]
Available-for-sale:
Maturity in Years	1 to 2
Amortized Cost	6,279
Gross Unrealized Gains	0
Gross Unrealized Losses	(7)
Estimated Fair Value	$ 6,272

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