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Available-for-Sale Securities
 6 Months Ended
Jun. 30, 2021
Investments Debt And Equity Securities [Abstract]  
Available-for-Sale Securities

5. Available-for-Sale Securities


As of June 30, 2021, the fair value of available-for-sale securities by type of security was as follows:

 

 

June 30, 2021

 

 

 

Amortized

Cost

 

 

Gross

Unrealized

Gain

 

 

Gross

Unrealized

Loss

 

 

Fair

Value

 

Investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bond securities

 

$

38,366

 

 

$

—

 

 

$

(11

)

 

$

38,355

 

Commercial paper

 

$

9,995

 

 

$

—

 

 

$

—

 

 

$

9,995

 

 

 

$

48,361

 

 

$

—

 

 

$

(11

)

 

$

48,350

 

As of December 31, 2020, there were no available-for-sale securities.

 

The estimated fair value and amortized cost of the Company’s available-for-sale securities by contractual maturity are summarized as follows:

 

 

 

June 30, 2021

 

 

 

Amortized

Cost

 

 

Fair

Value

 

Due in one year or less

 

$

48,361

 

 

$

48,350

 

Total available-for-sale securities

 

$

48,361

 

 

$

48,350

 

The weighted average maturity of the Company’s available-for-sale securities as of June 30, 2021 was approximately 0.5 years. As of December 31, 2020, there were no available-for-sale securities.