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Fair Value Measurements - Summary of Marketable Securities (Parenthetical) (Detail)
 9 Months Ended
Sep. 30, 2016
U.S. Government Securities [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Marketable securities maturity period 1 year
Corporate Bonds [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Marketable securities maturity period 1 year
Commercial Paper [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Marketable securities maturity period 1 year