Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities and Fair Value Measurements - Summary of Company's Available-for-Sale Securities (Detail)

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Marketable Securities and Fair Value Measurements - Summary of Company's Available-for-Sale Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]    
Cost Basis $ 173,604 $ 92,443
Fair Value 141,783 68,667
Fair Value 6,013 0
Cash Equivalents - Money Market Funds, Commercial Paper and Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Cost Basis 25,807 23,793
Unrealized Gain 0 0
Unrealized Loss 0 0
Fair Value 25,807 23,793
Marketable Securities, Current - Commercial Paper, Treasury Bills and Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Cost Basis 141,780 68,650
Unrealized Gain 8 19
Unrealized Loss (5) (2)
Fair Value 141,783 $ 68,667
Marketable Securities, Non-current - Treasury Bills    
Schedule Of Available For Sale Securities [Line Items]    
Unrealized Gain 0  
Unrealized Loss (4)  
Cost Basis 6,017  
Fair Value $ 6,013