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Short-term Investments (Tables)
12 Months Ended
Dec. 31, 2020
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, 2020:
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Aggregate
Fair Value
United States government debt securities$48,048 $14 $(1)$48,061 
Certificates of deposit264 — — 264 
Total$48,312 $14 $(1)$48,325 
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 $$— $8,996 
Certificates of deposit264 — — 264 
Total$9,253 $$— $9,260