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Fair Value Measurements (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Short-term investments:    
Total short-term investments $ 9,331,000 $ 9,826,000
Restricted cash-money market fund 875,000 875,000
Recurring basis [Member]
    
Cash equivalents:    
Total cash equivalents 8,777,000 7,313,000
Short-term investments:    
Total short-term investments 9,331,000 9,826,000
Restricted cash-money market fund 875,000 875,000
Total assets measured at fair value 18,983,000 18,014,000
Recurring basis [Member] | Money market funds [Member]
    
Cash equivalents:    
Total cash equivalents 8,777,000 7,313,000
Recurring basis [Member] | Municipal Securities [Member]
    
Short-term investments:    
Total short-term investments   356,000
Recurring basis [Member] | Corporate commercial paper [Member]
    
Short-term investments:    
Total short-term investments 1,250,000 4,374,000
Recurring basis [Member] | Foreign government bonds [Member]
    
Short-term investments:    
Total short-term investments 1,001,000 999,000
Recurring basis [Member] | Corporate debt securities [Member]
    
Short-term investments:    
Total short-term investments 7,080,000 4,097,000
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Cash equivalents:    
Total cash equivalents 8,777,000 7,313,000
Short-term investments:    
Total short-term investments      
Restricted cash-money market fund 875,000 875,000
Total assets measured at fair value 9,652,000 8,188,000
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money market funds [Member]
    
Cash equivalents:    
Total cash equivalents 8,777,000 7,313,000
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Municipal Securities [Member]
    
Short-term investments:    
Total short-term investments     
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate commercial paper [Member]
    
Short-term investments:    
Total short-term investments      
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign government bonds [Member]
    
Short-term investments:    
Total short-term investments      
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate debt securities [Member]
    
Short-term investments:    
Total short-term investments      
Recurring basis [Member] | Direct or Indirect Observable Inputs (Level 2) [Member]
    
Cash equivalents:    
Total cash equivalents      
Short-term investments:    
Total short-term investments 9,331,000 9,826,000
Restricted cash-money market fund      
Total assets measured at fair value 9,331,000 9,826,000
Recurring basis [Member] | Direct or Indirect Observable Inputs (Level 2) [Member] | Money market funds [Member]
    
Cash equivalents:    
Total cash equivalents      
Recurring basis [Member] | Direct or Indirect Observable Inputs (Level 2) [Member] | Municipal Securities [Member]
    
Short-term investments:    
Total short-term investments   356,000
Recurring basis [Member] | Direct or Indirect Observable Inputs (Level 2) [Member] | Corporate commercial paper [Member]
    
Short-term investments:    
Total short-term investments 1,250,000 4,374,000
Recurring basis [Member] | Direct or Indirect Observable Inputs (Level 2) [Member] | Foreign government bonds [Member]
    
Short-term investments:    
Total short-term investments 1,001,000 999,000
Recurring basis [Member] | Direct or Indirect Observable Inputs (Level 2) [Member] | Corporate debt securities [Member]
    
Short-term investments:    
Total short-term investments 7,080,000 4,097,000
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
    
Cash equivalents:    
Total cash equivalents      
Short-term investments:    
Total short-term investments      
Restricted cash-money market fund      
Total assets measured at fair value      
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Money market funds [Member]
    
Cash equivalents:    
Total cash equivalents      
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Municipal Securities [Member]
    
Short-term investments:    
Total short-term investments     
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate commercial paper [Member]
    
Short-term investments:    
Total short-term investments      
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Foreign government bonds [Member]
    
Short-term investments:    
Total short-term investments      
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate debt securities [Member]
    
Short-term investments:    
Total short-term investments