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Short-term and Long-term Investments
 9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Short-term and Long-term Investments Short-term and Long-term Investments
The Company's investments are classified as available-for-sale. The following table summarizes the amortized cost, gross unrealized gains and losses, and fair value of available-for-sale investments as of September 30, 2021:
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Aggregate
Fair Value
U.S. government debt securities$139,375 $5 $(35)$139,345 
Certificates of deposit265 — — 265 
Total$139,640 $5 $(35)$139,610 
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
U.S. government debt securities$48,048 $14 $(1)$48,061 
Certificates of deposit264 — — 264 
Total$48,312 $14 $(1)$48,325 
The estimated fair value of available-for-sale investments classified by their contractual maturities as of September 30, 2021 was:
Due within one year$72,684 
After one year through two years66,926 
Total$139,610 
Changes in market interest rates and bond yields cause certain investments to fall below their cost basis, resulting in unrealized losses on investments. The unrealized losses of the Company's debt security investments are not significant as of September 30, 2021.