Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Schedule of Amortized Cost and Estimated Fair Value of Bonds by Contractual Maturity (Detail)

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Significant Accounting Policies - Schedule of Amortized Cost and Estimated Fair Value of Bonds by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Collaboration Arrangement Disclosure [Abstract]  
Amortized Cost, Due in 1 year or less   
Amortized Cost, Due in 1-2 years   
Amortized Cost, Due in 2-5 years   
Amortized Cost, Due after 5 years 7,253
Amortized Cost, Total investments 7,253
Estimated Market Value, Due in 1 year or less   
Estimated Market Value, Due in 1-2 years   
Estimated Market Value, Due in 2-5 years   
Estimated Market Value, Due after 5 years 4,092
Estimated Market Value, Total investments $ 4,092