Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Schedule of Marketable Securities Classified as Available-for-Sale (Detail)

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Summary of Significant Accounting Policies - Schedule of Marketable Securities Classified as Available-for-Sale (Detail) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 16,710 $ 33,795
Gross Unrealized Gains 0 0
Gross Unrealized Losses (5) (21)
Estimated Fair Value 16,705 33,774
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 12,797 27,663
Gross Unrealized Gains 0 0
Gross Unrealized Losses (4) (17)
Estimated Fair Value 12,793 27,646
Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,913 4,623
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1) (2)
Estimated Fair Value $ 3,912 4,621
Government Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   1,509
Gross Unrealized Gains   0
Gross Unrealized Losses   (2)
Estimated Fair Value   $ 1,507