XML 26 R37.htm IDEA: XBRL DOCUMENT v2.4.0.8
Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Short-term investments:    
Total short-term investments $ 7,295 $ 9,826
Restricted cash-money market fund 250 875
Corporate commercial paper [Member]
    
Short-term investments:    
Total short-term investments 1,500 4,374
Foreign government bonds [Member]
    
Short-term investments:    
Total short-term investments 1,001 999
Corporate debt securities [Member]
    
Short-term investments:    
Total short-term investments 4,794 4,097
Municipal securities [Member]
    
Short-term investments:    
Total short-term investments   356
Recurring basis [Member]
    
Short-term investments:    
Total short-term investments 7,295 9,826
Restricted cash-money market fund 250 875
Total assets measured at fair value 18,534 18,014
Recurring basis [Member] | Corporate commercial paper [Member]
    
Short-term investments:    
Total short-term investments 1,500 4,374
Recurring basis [Member] | Foreign government bonds [Member]
    
Short-term investments:    
Total short-term investments 1,001 999
Recurring basis [Member] | Corporate debt securities [Member]
    
Short-term investments:    
Total short-term investments 4,794 4,097
Recurring basis [Member] | Municipal securities [Member]
    
Short-term investments:    
Total short-term investments   356
Recurring basis [Member] | Cash equivalents-money market fund [Member]
    
Assets:    
Cash equivalents-money market fund 10,989 7,313
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring basis [Member]
    
Short-term investments:    
Total short-term investments      
Restricted cash-money market fund 250 875
Total assets measured at fair value 11,239 8,188
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring basis [Member] | Corporate commercial paper [Member]
    
Short-term investments:    
Total short-term investments      
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring basis [Member] | Foreign government bonds [Member]
    
Short-term investments:    
Total short-term investments      
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring basis [Member] | Corporate debt securities [Member]
    
Short-term investments:    
Total short-term investments      
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring basis [Member] | Municipal securities [Member]
    
Short-term investments:    
Total short-term investments     
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring basis [Member] | Cash equivalents-money market fund [Member]
    
Assets:    
Cash equivalents-money market fund 10,989 7,313
Direct or Indirect Observable Inputs (Level 2) [Member] | Recurring basis [Member]
    
Short-term investments:    
Total short-term investments 7,295 9,826
Restricted cash-money market fund      
Total assets measured at fair value 7,295 9,826
Direct or Indirect Observable Inputs (Level 2) [Member] | Recurring basis [Member] | Corporate commercial paper [Member]
    
Short-term investments:    
Total short-term investments 1,500 4,374
Direct or Indirect Observable Inputs (Level 2) [Member] | Recurring basis [Member] | Foreign government bonds [Member]
    
Short-term investments:    
Total short-term investments 1,001 999
Direct or Indirect Observable Inputs (Level 2) [Member] | Recurring basis [Member] | Corporate debt securities [Member]
    
Short-term investments:    
Total short-term investments 4,794 4,097
Direct or Indirect Observable Inputs (Level 2) [Member] | Recurring basis [Member] | Municipal securities [Member]
    
Short-term investments:    
Total short-term investments   356
Direct or Indirect Observable Inputs (Level 2) [Member] | Recurring basis [Member] | Cash equivalents-money market fund [Member]
    
Assets:    
Cash equivalents-money market fund