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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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