Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Marketable Securities (Detail)

v2.4.0.8
Fair Value Measurements - Summary of Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash, amortized cost and estimated fair value $ 17,934      
Cash and cash equivalents, amortized cost and estimated fair value 48,950 14,593 12,950 18,075
Restricted cash, amortized cost and estimated fair value 251 314    
Amortized Cost 5,061      
Gross Unrealized Gains         
Gross Unrealized Losses (4)      
Estimated Fair Value 5,057      
Corporate bonds and commercial paper [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Amortized Cost 5,061      
Gross Unrealized Gains         
Gross Unrealized Losses (4)      
Estimated Fair Value 5,057      
Money market securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Money market securities, amortized cost and estimated fair value 31,016      
Restricted cash, amortized cost and estimated fair value $ 251