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Fair Value Measurement of Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
    
Cash equivalents    
Total cash equivalents $ 6,584 $ 30,921
Available-for-sale:    
Total long-term marketable securities 6,174 13,495
Total short-term marketable securities 39,958 28,267
Total financial assets 52,716 72,683
Fair Value, Measurements, Recurring [Member] | Government agency securities [Member]
    
Available-for-sale:    
Total long-term marketable securities 3,001 3,738
Total short-term marketable securities 3,681 6,912
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member]
    
Available-for-sale:    
Total long-term marketable securities 805 5,969
Total short-term marketable securities 14,689 8,384
Fair Value, Measurements, Recurring [Member] | Certificates of deposit [Member]
    
Available-for-sale:    
Total long-term marketable securities 2,368 3,788
Total short-term marketable securities 4,081 4,321
Fair Value, Measurements, Recurring [Member] | Corporate debentures / bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 17,507 8,612
Fair Value, Measurements, Recurring [Member] | Marketable equity securities [Member]
    
Available-for-sale:    
Total short-term marketable securities   38
Fair Value, Measurements, Recurring [Member] | Money market funds [Member]
    
Cash equivalents    
Total cash equivalents 5,146 25,137
Fair Value, Measurements, Recurring [Member] | US Treasury securities [Member]
    
Cash equivalents    
Total cash equivalents 1,438 5,784
Level 1 [Member]
    
Cash equivalents    
Total cash equivalents 5,146 25,137
Available-for-sale:    
Total short-term marketable securities   38
Total financial assets 5,146 25,175
Level 1 [Member] | Marketable equity securities [Member]
    
Available-for-sale:    
Total short-term marketable securities   38
Level 1 [Member] | Money market funds [Member]
    
Cash equivalents    
Total cash equivalents 5,146 25,137
Level 2 [Member]
    
Cash equivalents    
Total cash equivalents 1,438 5,784
Available-for-sale:    
Total long-term marketable securities 6,174 13,495
Total short-term marketable securities 39,958 28,229
Total financial assets 47,570 47,508
Level 2 [Member] | Government agency securities [Member]
    
Available-for-sale:    
Total long-term marketable securities 3,001 3,738
Total short-term marketable securities 3,681 6,912
Level 2 [Member] | Municipal bonds [Member]
    
Available-for-sale:    
Total long-term marketable securities 805 5,969
Total short-term marketable securities 14,689 8,384
Level 2 [Member] | Certificates of deposit [Member]
    
Available-for-sale:    
Total long-term marketable securities 2,368 3,788
Total short-term marketable securities 4,081 4,321
Level 2 [Member] | Corporate debentures / bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 17,507 8,612
Level 2 [Member] | US Treasury securities [Member]
    
Cash equivalents    
Total cash equivalents $ 1,438 $ 5,784