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
Mar. 31, 2020
Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items]    
Cost Basis $ 105,247 $ 125,487
Fair Value 70,544 39,633
Fair Value 3,010 1,510
Cash Equivalents - Money Market Funds, Commercial Paper and Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Cost Basis 31,972 84,361
Unrealized Gain 2 1
Unrealized Loss 0 0
Fair Value 31,974 84,362
Marketable Securities, Current - Commercial Paper, Treasury Bills and Corporate Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Cost Basis 70,274 39,616
Unrealized Gain 273 17
Unrealized Loss (3) 0
Fair Value 70,544 39,633
Marketable Securities, Non-current - Treasury Bills    
Schedule Of Available For Sale Securities [Line Items]    
Unrealized Gain 10 0
Unrealized Loss 0 0
Cost Basis 3,000 1,510
Fair Value $ 3,010 $ 1,510