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Short-term Investments (Tables)
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investments The following table summarizes the amortized cost, gross unrealized gains and losses, and fair value of available-for-sale investments as of December 31, 2019:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Aggregate
Fair Value
United States government debt securities
$
8,989

 
$
7

 
$
—

 
$
8,996

Certificates of deposit
264

 
—

 
—

 
264

Total
$
9,253

 
$
7

 
$
—

 
$
9,260


The following table summarizes the amortized cost, gross unrealized gains and losses, and fair value of available-for-sale investments as of December 31, 2018:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Aggregate
Fair Value
United States government debt securities
$
119,401

 
$
—

 
$
(61
)
 
$
119,340

Certificates of deposit
274

 
—

 
—

 
274

Total
$
119,675

 
$
—

 
$
(61
)
 
$
119,614