Quarterly report pursuant to Section 13 or 15(d)

Short-term Investments - Summary of Debt Securities by Major Security Type (Detail)

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Short-term Investments - Summary of Debt Securities by Major Security Type (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost $ 4,999 $ 15,967
Gross unrealized gains 11 26
Gross unrealized losses (7)  
Fair value 5,003 15,993
U.S. Agency Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost   1,000
Fair value   1,000
U.S. Government Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost 4,999 14,967
Gross unrealized gains 11 26
Gross unrealized losses (7)  
Fair value $ 5,003 $ 14,993