Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Marketable Securities (Detail)

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Fair Value Measurements - Summary of Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash, amortized cost and estimated fair value $ 15,348      
Restricted cash, amortized cost and estimated fair value 251 314    
Cash and cash equivalents, amortized cost and estimated fair value 28,630 14,593 18,628 18,075
Corporate bonds and commercial paper [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Amortized Cost 8,921      
Gross Unrealized Gains 1      
Gross Unrealized Losses         
Estimated Fair Value 8,922      
Total short-term investments [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Amortized Cost 8,921      
Gross Unrealized Gains 1      
Gross Unrealized Losses         
Estimated Fair Value 8,922      
Money market securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Money market securities, amortized cost and estimated fair value 13,282      
Restricted cash, amortized cost and estimated fair value $ 251