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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Short-term investments:    
Total short-term investments $ 13,029 $ 7,295
Restricted cash-money market fund 250 250
Corporate debt securities [Member]
    
Short-term investments:    
Total short-term investments 11,831 4,794
Corporate commercial paper [Member]
    
Short-term investments:    
Total short-term investments 1,198 1,500
Foreign government bonds [Member]
    
Short-term investments:    
Total short-term investments 0 1,001
Recurring basis [Member]
    
Cash equivalents:    
Total cash equivalents 8,558 10,989
Short-term investments:    
Total short-term investments 13,029 7,295
Restricted cash-money market fund 250 250
Total assets measured at fair value 21,837 18,534
Recurring basis [Member] | Corporate debt securities [Member]
    
Cash equivalents:    
Total cash equivalents 1,252 2,000
Short-term investments:    
Total short-term investments 11,831 4,794
Recurring basis [Member] | Corporate commercial paper [Member]
    
Short-term investments:    
Total short-term investments 1,198 1,500
Recurring basis [Member] | Foreign government bonds [Member]
    
Short-term investments:    
Total short-term investments   1,001
Recurring basis [Member] | Money market funds [Member]
    
Cash equivalents:    
Total cash equivalents 7,306 8,989
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring basis [Member]
    
Cash equivalents:    
Total cash equivalents 7,306 8,989
Short-term investments:    
Total short-term investments 0 0
Restricted cash-money market fund 250 250
Total assets measured at fair value 7,556 9,239
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring basis [Member] | Corporate debt securities [Member]
    
Cash equivalents:    
Total cash equivalents 0 0
Short-term investments:    
Total short-term investments 0 0
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 0 0
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   0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring basis [Member] | Money market funds [Member]
    
Cash equivalents:    
Total cash equivalents 7,306 8,989
Direct or Indirect Observable Inputs (Level 2) [Member] | Recurring basis [Member]
    
Cash equivalents:    
Total cash equivalents 1,252 2,000
Short-term investments:    
Total short-term investments 13,029 7,295
Restricted cash-money market fund 0 0
Total assets measured at fair value 14,281 9,295
Direct or Indirect Observable Inputs (Level 2) [Member] | Recurring basis [Member] | Corporate debt securities [Member]
    
Cash equivalents:    
Total cash equivalents 1,252 2,000
Short-term investments:    
Total short-term investments 11,831 4,794
Direct or Indirect Observable Inputs (Level 2) [Member] | Recurring basis [Member] | Corporate commercial paper [Member]
    
Short-term investments:    
Total short-term investments 1,198 1,500
Direct or Indirect Observable Inputs (Level 2) [Member] | Recurring basis [Member] | Foreign government bonds [Member]
    
Short-term investments:    
Total short-term investments   1,001
Direct or Indirect Observable Inputs (Level 2) [Member] | Recurring basis [Member] | Money market funds [Member]
    
Cash equivalents:    
Total cash equivalents $ 0 $ 0