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Short-term Investments
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Short-term Investments Short-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 June 30, 2020:
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Aggregate
Fair Value
U.S. government debt securities$85,749  $279  $—  $86,028  
Certificates of deposit264  —  —  264  
Total$86,013  $279  $—  $86,292  
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
U.S. government debt securities$8,989  $7  $—  $8,996  
Certificates of deposit264  —  —  264  
Total$9,253  $7  $—  $9,260  
As of June 30, 2020, all of the available-for-sale investments were due within one year based on their contractual maturities.
Changes in market interest rates and bond yields cause certain investments to fall below their cost basis, resulting in unrealized losses on investments. None of the Company's debt security investments were in an unrealized loss position as of June 30, 2020.