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Fair Value Measurement of Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
    
Cash equivalents    
Total cash equivalents $ 3,476 $ 30,921
Available-for-sale:    
Total short-term marketable securities 38,064 28,267
Total long-term marketable securities 1,201 13,495
Total financial assets 42,741 72,683
Fair Value, Measurements, Recurring [Member] | Government agency securities [Member]
    
Available-for-sale:    
Total short-term marketable securities 3,266 6,912
Total long-term marketable securities   3,738
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 11,260 8,384
Total long-term marketable securities   5,969
Fair Value, Measurements, Recurring [Member] | Certificates of deposit [Member]
    
Available-for-sale:    
Total short-term marketable securities 6,205 4,321
Total long-term marketable securities 1,201 3,788
Fair Value, Measurements, Recurring [Member] | Corporate debentures / bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 17,333 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 47 25,137
Fair Value, Measurements, Recurring [Member] | US Treasury securities [Member]
    
Cash equivalents    
Total cash equivalents 3,429 5,784
Level 1 [Member]
    
Cash equivalents    
Total cash equivalents 47 25,137
Available-for-sale:    
Total short-term marketable securities 0 38
Total long-term marketable securities 0 0
Total financial assets 47 25,175
Level 1 [Member] | Government agency securities [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 0
Total long-term marketable securities   0
Level 1 [Member] | Municipal bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 0
Total long-term marketable securities   0
Level 1 [Member] | Certificates of deposit [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 0
Total long-term marketable securities 0 0
Level 1 [Member] | Corporate debentures / bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 0
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 47 25,137
Level 1 [Member] | US Treasury securities [Member]
    
Cash equivalents    
Total cash equivalents 0 0
Level 2 [Member]
    
Cash equivalents    
Total cash equivalents 3,429 5,784
Available-for-sale:    
Total short-term marketable securities 38,064 28,229
Total long-term marketable securities 1,201 13,495
Total financial assets 42,694 47,508
Level 2 [Member] | Government agency securities [Member]
    
Available-for-sale:    
Total short-term marketable securities 3,266 6,912
Total long-term marketable securities   3,738
Level 2 [Member] | Municipal bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 11,260 8,384
Total long-term marketable securities   5,969
Level 2 [Member] | Certificates of deposit [Member]
    
Available-for-sale:    
Total short-term marketable securities 6,205 4,321
Total long-term marketable securities 1,201 3,788
Level 2 [Member] | Corporate debentures / bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 17,333 8,612
Level 2 [Member] | Marketable equity securities [Member]
    
Available-for-sale:    
Total short-term marketable securities   0
Level 2 [Member] | Money market funds [Member]
    
Cash equivalents    
Total cash equivalents 0 0
Level 2 [Member] | US Treasury securities [Member]
    
Cash equivalents    
Total cash equivalents $ 3,429 $ 5,784