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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]    
Highly liquid marketable securities with original maturities 90 days or less  
Cash equivalents include primarily money market securities, corporate notes and certificates of deposits $ 10,881,000 $ 2,401,000
Short-term marketable securities maturity description Over 90 days that mature in less than one-year  
Marketable securities other-than temporary impairments $ 0  
Credit exposure to any one financial institution or type of financial instrument 5% of its cash equivalents and marketable securities or $1,000, whichever is greater  
Percentage of credit exposure to any one financial institution or type of financial instrument 5.00%  
Maximum amount of credit exposure to any one financial institution or type of financial instrument $ 1,000,000  
Credit exposure limits of cash and cash equivalents and marketable securities 40% of its cash equivalents and marketable securities, or $15,000, whichever is greater  
Percentage of credit exposure limits based on cash and cash equivalents and marketable securities 40.00%  
Credit exposure limits of cash and cash equivalents and marketable securities under option two $ 15,000,000  
Purchase price adjustment date 1 year  
Term of patent 17 years