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Description of Business and Summary of Significant Accounting Policies - Summary of Fair Value Maturities for Financial Asset (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Fair Value Disclosures [Abstract]  
Cash equivalents and marketable securities, Maturities by Period, Total $ 66,676
Cash equivalents and marketable securities, Maturities by Period, Less than 1 year 66,676
Cash equivalents and marketable securities, Maturities by Period, 1-5 years 0
Cash equivalents and marketable securities, Maturities by Period, 5-10 years 0
Cash equivalents and marketable securities, Maturities by Period, More than 10 years $ 0